Porsche 911 993
Weaknesses, engine ratings and buying advice
450 PS
Turbo S · Benzin
183 units — the pinnacle of air cooling
Legendary!430 PS
3.6L Boxer Biturbo GT2 Benzin
5 weaknesses
Stay Away!Body Variants
The Porsche 911 993 is available as Coupé and Convertible — choose your body type for specific insurance data:
Generations
Engine Overview
The Porsche 911 993 is available with 12 engine variants — from 272 to 450 hp. 2 variants had engine changes — the model year is crucial.
The M64/05 is the last air-cooled boxer without the VarioRam intake — pure craftsmanship of the 993 era. It produces the typical boxer growl that transitions from 4,000 rpm into a tinny howl, sonically rawer and more direct than the later VarioRam engine. The power delivery is linear and good-natured, though it lacks the perceptible shove the VarioRam system delivers from about 5,000 rpm in the M64/21 — a direct comparison reveals the difference in top-end punch. It's considered absolutely reliable provided oil level and cooling air openings are maintained; the biggest risk is oil leaks, which in the worst case lead to engine failure. As a purchase it's often recommended as a more affordable entry into the world of air-cooled 911s; the difference from the VarioRam model is barely noticeable in daily driving.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 80,000 km
The plastic lower valve cover gaskets are a well-known 993 weak point. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Replace both gasket and cover.
Symptoms: Whitish smoke from the rear after motorway driving, oil traces on the rear lid and bumper, oil smell inside the cabin. - !! Chain case gasket leaking from 150,000 km
Chain case seals become porous and leak oil. Repair requires engine removal. Main cause of age-related oil loss on the 993. Address together with valve cover gaskets.
Symptoms: Oil film on underbody panelling, oil smell after extended driving, oil traces on engine block in the chain case area.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/21 with VarioRam is the full promise of the last air-cooled 911: from about 5,000 rpm the variable intake opens and the engine pulls in a second wave with noticeable urgency — an effect affectionately known as the "VarioRam kick". The sound is distinctive, with the typical air-cooled boxer tone in the lower rev range and an almost shrieking top end to 6,800 rpm. Reliability-wise it's fundamentally robust like the 3.6 naturally aspirated, but regular oil checks are mandatory since oil leaks remain the classic Achilles heel of the range. Among 993s the VarioRam engine is considered the best naturally aspirated unit Porsche ever built for air cooling — the character is right, the mechanicals too.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 100,000 km
Like the M64/05, the plastic valve covers are prone to leaking. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Check chain case gaskets at the same time.
Symptoms: Oil traces at the rear, whitish smoke after motorway driving, oil smell when switching off. - !! Chain case gasket leaking from 100,000 km
Age-related oil leak in the chain case area. Repair requires engine removal. Replace valve cover gaskets, spark plugs and oil pressure sender seal at the same time.
Symptoms: Oil film on underbody panelling, oil loss without visible external source, oil smell after driving.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/05 is the last air-cooled boxer without the VarioRam intake — pure craftsmanship of the 993 era. It produces the typical boxer growl that transitions from 4,000 rpm into a tinny howl, sonically rawer and more direct than the later VarioRam engine. The power delivery is linear and good-natured, though it lacks the perceptible shove the VarioRam system delivers from about 5,000 rpm in the M64/21 — a direct comparison reveals the difference in top-end punch. It's considered absolutely reliable provided oil level and cooling air openings are maintained; the biggest risk is oil leaks, which in the worst case lead to engine failure. As a purchase it's often recommended as a more affordable entry into the world of air-cooled 911s; the difference from the VarioRam model is barely noticeable in daily driving.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 80,000 km
The plastic lower valve cover gaskets are a well-known 993 weak point. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Replace both gasket and cover.
Symptoms: Whitish smoke from the rear after motorway driving, oil traces on the rear lid and bumper, oil smell inside the cabin. - !! Chain case gasket leaking from 150,000 km
Chain case seals become porous and leak oil. Repair requires engine removal. Main cause of age-related oil loss on the 993. Address together with valve cover gaskets.
Symptoms: Oil film on underbody panelling, oil smell after extended driving, oil traces on engine block in the chain case area.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/21 with VarioRam is the full promise of the last air-cooled 911: from about 5,000 rpm the variable intake opens and the engine pulls in a second wave with noticeable urgency — an effect affectionately known as the "VarioRam kick". The sound is distinctive, with the typical air-cooled boxer tone in the lower rev range and an almost shrieking top end to 6,800 rpm. Reliability-wise it's fundamentally robust like the 3.6 naturally aspirated, but regular oil checks are mandatory since oil leaks remain the classic Achilles heel of the range. Among 993s the VarioRam engine is considered the best naturally aspirated unit Porsche ever built for air cooling — the character is right, the mechanicals too.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 100,000 km
Like the M64/05, the plastic valve covers are prone to leaking. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Check chain case gaskets at the same time.
Symptoms: Oil traces at the rear, whitish smoke after motorway driving, oil smell when switching off. - !! Chain case gasket leaking from 100,000 km
Age-related oil leak in the chain case area. Repair requires engine removal. Replace valve cover gaskets, spark plugs and oil pressure sender seal at the same time.
Symptoms: Oil film on underbody panelling, oil loss without visible external source, oil smell after driving.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/05 is the last air-cooled boxer without the VarioRam intake — pure craftsmanship of the 993 era. It produces the typical boxer growl that transitions from 4,000 rpm into a tinny howl, sonically rawer and more direct than the later VarioRam engine. The power delivery is linear and good-natured, though it lacks the perceptible shove the VarioRam system delivers from about 5,000 rpm in the M64/21 — a direct comparison reveals the difference in top-end punch. It's considered absolutely reliable provided oil level and cooling air openings are maintained; the biggest risk is oil leaks, which in the worst case lead to engine failure. As a purchase it's often recommended as a more affordable entry into the world of air-cooled 911s; the difference from the VarioRam model is barely noticeable in daily driving.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 80,000 km
The plastic lower valve cover gaskets are a well-known 993 weak point. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Replace both gasket and cover.
Symptoms: Whitish smoke from the rear after motorway driving, oil traces on the rear lid and bumper, oil smell inside the cabin. - !! Chain case gasket leaking from 150,000 km
Chain case seals become porous and leak oil. Repair requires engine removal. Main cause of age-related oil loss on the 993. Address together with valve cover gaskets.
Symptoms: Oil film on underbody panelling, oil smell after extended driving, oil traces on engine block in the chain case area.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/21 with VarioRam is the full promise of the last air-cooled 911: from about 5,000 rpm the variable intake opens and the engine pulls in a second wave with noticeable urgency — an effect affectionately known as the "VarioRam kick". The sound is distinctive, with the typical air-cooled boxer tone in the lower rev range and an almost shrieking top end to 6,800 rpm. Reliability-wise it's fundamentally robust like the 3.6 naturally aspirated, but regular oil checks are mandatory since oil leaks remain the classic Achilles heel of the range. Among 993s the VarioRam engine is considered the best naturally aspirated unit Porsche ever built for air cooling — the character is right, the mechanicals too.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 100,000 km
Like the M64/05, the plastic valve covers are prone to leaking. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Check chain case gaskets at the same time.
Symptoms: Oil traces at the rear, whitish smoke after motorway driving, oil smell when switching off. - !! Chain case gasket leaking from 100,000 km
Age-related oil leak in the chain case area. Repair requires engine removal. Replace valve cover gaskets, spark plugs and oil pressure sender seal at the same time.
Symptoms: Oil film on underbody panelling, oil loss without visible external source, oil smell after driving.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/05 is the last air-cooled boxer without the VarioRam intake — pure craftsmanship of the 993 era. It produces the typical boxer growl that transitions from 4,000 rpm into a tinny howl, sonically rawer and more direct than the later VarioRam engine. The power delivery is linear and good-natured, though it lacks the perceptible shove the VarioRam system delivers from about 5,000 rpm in the M64/21 — a direct comparison reveals the difference in top-end punch. It's considered absolutely reliable provided oil level and cooling air openings are maintained; the biggest risk is oil leaks, which in the worst case lead to engine failure. As a purchase it's often recommended as a more affordable entry into the world of air-cooled 911s; the difference from the VarioRam model is barely noticeable in daily driving.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 80,000 km
The plastic lower valve cover gaskets are a well-known 993 weak point. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Replace both gasket and cover.
Symptoms: Whitish smoke from the rear after motorway driving, oil traces on the rear lid and bumper, oil smell inside the cabin. - !! Chain case gasket leaking from 150,000 km
Chain case seals become porous and leak oil. Repair requires engine removal. Main cause of age-related oil loss on the 993. Address together with valve cover gaskets.
Symptoms: Oil film on underbody panelling, oil smell after extended driving, oil traces on engine block in the chain case area.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/22 is technically identical to the M64/21 — same power, same VarioRam character, same sound. Intake surge from 5,000 rpm, the unmistakable air-cooled boxer rumble, the same top-end urgency. Reliability and maintenance needs match the M64/21 completely. The only difference is the gearbox: this engine was exclusively paired with the 4-speed Tiptronic S.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous (oil loss) from 80,000 km
Plastic valve covers leak under heat and age. Metal press-fit inserts work loose. Oil drips onto the hot exhaust system — fire risk. Repair kit approx. €200–300.
Symptoms: Oil smell after driving; oil spots under the vehicle; visible oil film on the underside of the engine. - !! Chain case gasket leaking from 100,000 km
The gasket on the chain case housing (rear of the engine) leaks over time. Oil accumulates between engine and gearbox. Repair requires engine removal or at minimum gearbox separation.
Symptoms: Oil pooling between engine and gearbox; oil drops on the ground under the centre of the vehicle.
+ 7 more engine weaknesses + vehicle weaknesses
The M64/20 is the high-performance distillate of the air-cooled 3.8-litre boxer, built for the Carrera RS: forged pistons, lightened rocker arms, 102 mm bore vs. the 100 mm of the standard 3.6-litre. The engine revs more spontaneously and responds more directly to throttle than the road 3.6s, with a dry, mechanical sound that thinks more of motorsport than grand touring — dry sump lubrication included. Power delivery is linear to the 6,500 rpm redline, without turbo punch, but with the honesty typical of naturally aspirated engines. Among 911s it's considered one of the finest air-cooled engines ever; with only around 1,000 produced, it's extremely rare and correspondingly expensive to maintain. Failures are unheard of; the engine is designed for motorsport-level care.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Oil starvation under high-load track driving
The 993 RS uses a dry-sump system, which can nevertheless show oil pressure drops under extreme longitudinal loads on track. Suspension upgrades generating higher G-forces increase the risk.
Symptoms: Oil pressure warning under heavy braking or cornering on track, engine cuts under high G-loads - !! Valve guides worn (oil consumption, blue smoke) from 180,000 km
Valve guides wear under heat and high RPM. Excessive clearance draws oil along the valve stems into the combustion chamber. The cylinder head must be removed for boring and pressing in new guides.
Symptoms: Blue smoke on overrun and when lifting off the throttle; elevated oil consumption; oily spark plugs (cylinder-specific).
+ 7 more engine weaknesses + vehicle weaknesses
The M64/05 is the last air-cooled boxer without the VarioRam intake — pure craftsmanship of the 993 era. It produces the typical boxer growl that transitions from 4,000 rpm into a tinny howl, sonically rawer and more direct than the later VarioRam engine. The power delivery is linear and good-natured, though it lacks the perceptible shove the VarioRam system delivers from about 5,000 rpm in the M64/21 — a direct comparison reveals the difference in top-end punch. It's considered absolutely reliable provided oil level and cooling air openings are maintained; the biggest risk is oil leaks, which in the worst case lead to engine failure. As a purchase it's often recommended as a more affordable entry into the world of air-cooled 911s; the difference from the VarioRam model is barely noticeable in daily driving.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous from 80,000 km
The plastic lower valve cover gaskets are a well-known 993 weak point. Metal press-fit inserts work loose, oil drips onto the hot exhaust system. Replace both gasket and cover.
Symptoms: Whitish smoke from the rear after motorway driving, oil traces on the rear lid and bumper, oil smell inside the cabin. - !! Chain case gasket leaking from 150,000 km
Chain case seals become porous and leak oil. Repair requires engine removal. Main cause of age-related oil loss on the 993. Address together with valve cover gaskets.
Symptoms: Oil film on underbody panelling, oil smell after extended driving, oil traces on engine block in the chain case area.
+ 5 more engine weaknesses + vehicle weaknesses
The M64/22 is technically identical to the M64/21 — same power, same VarioRam character, same sound. Intake surge from 5,000 rpm, the unmistakable air-cooled boxer rumble, the same top-end urgency. Reliability and maintenance needs match the M64/21 completely. The only difference is the gearbox: this engine was exclusively paired with the 4-speed Tiptronic S.
- !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Valve cover gasket porous (oil loss) from 80,000 km
Plastic valve covers leak under heat and age. Metal press-fit inserts work loose. Oil drips onto the hot exhaust system — fire risk. Repair kit approx. €200–300.
Symptoms: Oil smell after driving; oil spots under the vehicle; visible oil film on the underside of the engine. - !! Chain case gasket leaking from 100,000 km
The gasket on the chain case housing (rear of the engine) leaks over time. Oil accumulates between engine and gearbox. Repair requires engine removal or at minimum gearbox separation.
Symptoms: Oil pooling between engine and gearbox; oil drops on the ground under the centre of the vehicle.
+ 7 more engine weaknesses + vehicle weaknesses
The M64/60R of the 993 GT2 is the biturbo boxer taken to extremes — more boost, less weight, less comfort. The sound is more mechanical and direct than in the Turbo, the turbo response more aggressive and less civilised. Power delivery explosive in the mid and upper rev range, described as "demanding and mercilessly honest." The vehicle has no AWD — 316 kW through the rear wheels, no ABS in the early version. Reliability is good with correct maintenance, but the engine tolerates no neglect. Among 911 enthusiasts the 993 GT2 is considered the rawer, more brutal counterpart to the 993 Turbo S — a motorsport legend with road registration.
- !! Turbocharger bearings worn (both units) from 150,000 km
The plain bearings in both KKK turbochargers wear at high mileage. Oil flow ceasing after shutdown without a cooldown period accelerates wear. Replacing both turbos at the same time is recommended.
Symptoms: Whistling from the turbo; rising oil consumption; blue smoke especially on cold start; pressure drop at high RPM. - !! Valve cover gasket porous (oil loss) from 80,000 km
Plastic valve covers leak under heat and age. Metal press-fit inserts work loose. Oil drips onto the hot exhaust system — fire risk. Repair kit approx. €200–300.
Symptoms: Oil smell after driving; oil spots under the vehicle; visible oil film on the underside of the engine. - !! DME relay heat death — engine won't start from 80,000 km
The DME relay fails through continuous energisation and heat. Typical breakdown scenario: starter cranks, engine won't fire. Often occurs after heat soaking (summer, full sun). At night or after cooling down the engine starts again — replace the relay first.
Symptoms: Engine cranks but won't start; no fuel pump priming noise after ignition ON; problem after heat soak.
+ 2 more engine weaknesses + vehicle weaknesses
The M64/60 biturbo is the crowning achievement of the air-cooled era: two small turbochargers — no charge cooling, air-to-air — give the 3.6-litre boxer a 300 kW shove, while the familiar air-cooled boxer tone remains as the base sound character, overlaid by quiet turbo whistle and a deeper, more massive exhaust note than the naturally aspirated engines. Barely any turbo lag thanks to the small twins; the engine is well usable from low revs. The 993 Turbo is a legend — it's the last air-cooled turbo 911 and thus by definition a collector's item. Technically considered very robust; the biturbo technology was mature by 1995. Weak points typically lie with the turbochargers themselves and the oil supply. It combines the character of the air-cooled heart with genuine turbo power — exactly what makes it unforgettable.
- !! Turbocharger bearings worn (both units) from 150,000 km
The plain bearings in both KKK turbochargers wear at high mileage. Oil flow ceasing after shutdown without a cooldown period accelerates wear. Replacing both turbos at the same time is recommended.
Symptoms: Whistling from the turbo; rising oil consumption; blue smoke especially on cold start; pressure drop at high RPM. - !! Engine bay wiring harness — insulation brittle (recall)
Porsche recalled approx. 20,000 vehicles (model years 1995–1996): bio-based plastic wiring harness insulation hardens, cracks under heat and vibration — short circuit and engine failure possible. Check recall status before purchase.
Symptoms: Electrical faults, engine failure, irregular injection; in the worst case a smouldering fire in the engine bay. - !! Boost control hose faulty from 80,000 km
The vacuum hose between the solenoid valve and wastegate ages and kinks. Boost pressure severely reduced (only 0.4 bar instead of target) despite intact turbos. Classic fault cause found after extensive diagnosis.
Symptoms: Significantly reduced power, boost pressure not reaching target, no fault code stored in the ECU.
+ 3 more engine weaknesses + vehicle weaknesses
The M64/60S of the 993 Turbo S is the final act of the air-cooled turbo line: 331 kW from the biturbo 3.6 with larger turbochargers, sport exhaust standard for more intense sound. The basic principle remains identical to the M64/60 — no turbo lag, spontaneous turbo character with an air-cooled boxer sound foundation — but the punch arrives earlier and lasts longer. Bottom line: the 993 Turbo S is the ultimate statement of the air-cooled era, and the engine is the core of that statement. Very rare, with only 183 produced, one of the most sought-after Porsches of all time. Technically closely related to the M64/60 and equally robust, but demands diligent care at high output.
- !! Turbocharger bearings worn (both units) from 150,000 km
The plain bearings in both KKK turbochargers wear at high mileage. Oil flow ceasing after shutdown without a cooldown period accelerates wear. Replacing both turbos at the same time is recommended.
Symptoms: Whistling from the turbo; rising oil consumption; blue smoke especially on cold start; pressure drop at high RPM. - !! Valve cover gasket porous (oil loss) from 80,000 km
Plastic valve covers leak under heat and age. Metal press-fit inserts work loose. Oil drips onto the hot exhaust system — fire risk. Repair kit approx. €200–300.
Symptoms: Oil smell after driving; oil spots under the vehicle; visible oil film on the underside of the engine. - !! DME relay heat death — engine won't start from 80,000 km
The DME relay fails through continuous energisation and heat. Typical breakdown scenario: starter cranks, engine won't fire. Often occurs after heat soaking (summer, full sun). At night or after cooling down the engine starts again — replace the relay first.
Symptoms: Engine cranks but won't start; no fuel pump priming noise after ignition ON; problem after heat soak.
+ 2 more engine weaknesses + vehicle weaknesses
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Rust window frame Windscreen and rear window frames are prone to rust, especially if windows were replaced incorrectly. Moisture ingress and adhesive residue accelerate the attack. Symptoms: Visible rust bubbles at the window edge, water ingress inside the cabin, rubber seal peeling off. | High | |
| Rust rear bumper support Hollow sections of the rear bumper supports rust from the inside due to dirt accumulation. Regular cleaning and cavity preservation are essential. Symptoms: Visible rust bubbles under the rear bumper trim, rotted hollow support tips visible during underside inspection. | Medium |
Top Reported Issues
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Known Problems and Issues +
A total of 87 weaknesses have been documented for the Porsche 911 993 (1993–1998) — 73 engine-related and 14 vehicle-related. One problem engine: M64/60R (3.6L Boxer Biturbo GT2). Typical issues affect Rust, Electronics, HVAC, Suspension.
911 (M64.50, 1993–1994) — Be Careful: Turbo bearings worn (cooldown required), Turbo bearing wear (KKK K27), K27 turbocharger bearing wear. Power: 360 PS.
911 (M64/05, 1994–1995) — Be Careful: Engine bay wiring harness — insulation brittle (recall), Valve cover gasket porous, Chain case gasket leaking. Power: 272 PS.
911 (M64/20, 1995–1996) — Be Careful: Engine bay wiring harness — insulation brittle (recall), Oil starvation under high-load track driving, Valve guides worn (oil consumption, blue smoke). Power: 300 PS.
911 (M64/60, 1995–1998) — Be Careful: Turbocharger bearings worn (both units), Engine bay wiring harness — insulation brittle (recall), Boost control hose faulty. Power: 408 PS.
911 (M64/60R, 1995–1997) — Stay Away!: Turbocharger bearings worn (both units), Valve cover gasket porous (oil loss), DME relay heat death — engine won't start. Power: 430 PS.
911 (M64/21, 1996–1998) — Be Careful: Engine bay wiring harness — insulation brittle (recall), Valve cover gasket porous, Chain case gasket leaking. Power: 285 PS.
911 (M64/22, 1996–1998) — Be Careful: Engine bay wiring harness — insulation brittle (recall), Valve cover gasket porous (oil loss), Chain case gasket leaking. Power: 285 PS.
911 (M96.01, 1997–2001) — Be Careful: IMS bearing single-row: engine failure risk, Bore scoring: cylinder bore wear, Cylinder head crack: oil in coolant. Power: 300 PS.
911 (M64/60S, 1997–1998) — Be Careful: Turbocharger bearings worn (both units), Valve cover gasket porous (oil loss), DME relay heat death — engine won't start. Power: 450 PS.
What to watch out for with the Porsche 911? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Porsche 911 993 have? +
What should I look for when buying a used Porsche 911 993? +
Which engine is recommended? +
Which Porsche 911 993 engine is the most fun? +
Is the Porsche 911 993 worth buying used? +
What horsepower variants are available for the Porsche 911 993? +
Last updated: February 2026 · All information without guarantee