BMW M3
4.0-litre V8, 420 hp, 8,300 rpm rev limit — eight individual throttle bodies, cross-plane crankshaft. Below 5,000 rpm a deep V8 grumble; from 7,500 rpm the note tips into the hysterical; at 8,000+ the cockpit vibrates noticeably — no isolation left between driver and machinery, and that is exactly the point. Con rod bearing shells are the fear issue: factory tolerances too tight (0.001" instead of 0.0025"), catastrophic failure on cold-start abuse. Preventive replacement with aftermarket bearings every 60,000–80,000 km; oil analysis before every purchase is mandatory. Throttle body actuators with plastic gears fail from 80,000 km — limp mode. Warm-up below 3,000 rpm is not a tip but a survival strategy. Last V8 M3, last M3 coupé, last naturally aspirated M3 — three last times in one car.
V8 Cabrio, folding roof, DKG — open sky meets 8,300 rpm
Roof down, Sport+ engaged, 5,000 rpm — eight individual throttle bodies scream directly above your head, the exhaust roars from the rear. The E93 M3 Cabrio is 150 kg heavier than the Coupé due to the retractable steel roof, and you feel it in fast direction changes. But it is the only open V8 M3 with high-revving character — this sound no longer exists in any modern BMW. For enthusiasts who want to hear the engine, not for lap time optimisers.
Engine Weaknesses 10
Factory bearing clearance of 0.025 mm instead of the recommended 0.063 mm. Under heat and high revs the bearing shells wear prematurely. Metal particles contaminate the entire oil system. Preventive replacement with ACL bearing shells and ARP bolts by 100,000 km at the latest.
Symptoms: Knocking from the engine block on a warm engine, dropping oil pressure at high revs, metal particles in the oil filter. In the final stage: sudden engine seizure.
All eight individual throttle bodies have electric actuator motors with plastic gears that inevitably break. From around 120,000 km, bank 2 typically fails first. Replace both banks at the same time; grease the linkage every 3 years. Fault codes 2B15/2B16.
Symptoms: Sudden power loss, limp mode active, DSC and EML lights on, engine runs rough after about 5 minutes of driving. Affects 100% of S65 engines at the relevant mileage.
The four VANOS hubs have plastic covers that become brittle and break with age. Fragments fall into the sump and can block the oil pick-up strainer — oil starvation and engine damage. Aluminium replacement covers (Evolve, MMX) are the permanent solution.
Symptoms: No warning — in the worst case sudden oil pressure loss and engine damage. Check preventively during connecting rod bearing service.
The Getrag GS7D36SG dual-clutch gearbox is fundamentally robust, but the clutch plates distort with frequent track use. Temperatures up to 690°C have been measured. The GTS filler plug for +1 litre of oil improves cooling. Flush and refill every 60,000 km.
Symptoms: Jerky gearshifts, slip on pull-away, gears not engaging, DCT fault message. In extreme cases only 1st gear and reverse available.
The magnesium cam covers lose their internal coating over time. New gaskets alone are then not enough — the covers must be powder-coated or Cerakote-coated, otherwise they weep again immediately. Spark plug tube O-rings are cast-in and can only be replaced with the tubes.
Symptoms: Oil smell in engine bay, visible weeping at the cam covers, oil patches on the engine block. Fast recurrence after gasket change without cover restoration.
The CCV check valves clog with oil sludge. Crankcase overpressure pushes oil into the intake manifolds and combustion chambers. BMW states up to 1 L/1,000 km as normal — with regular 10W-60 changes every 8,000 km, 0.2–0.3 L/1,000 km is realistic.
Symptoms: Oil consumption above 0.5 L/1,000 km, blue smoke on cold start, oil visible in intake tract, oil spray on rear bumper.
Electric water pump and thermostat fail at higher mileages. On the V8, overheating quickly causes consequential damage to the cylinder head and connecting rod bearings. Replace both together as the labour involved is identical.
Symptoms: Temperature gauge rises quickly, coolant loss, overheating warning on display, power reduction through limp mode.
The VTG actuator motor of the electronic limited slip differential wears through gear wear. Differential oil changes every 60,000 km with quality hypoid oil extend service life. Complete replacement at a BMW dealer is expensive; transmission specialists are considerably cheaper.
Symptoms: Clunking on load changes, stuttering in tight corners, DSC fault message, uneven torque distribution at the rear axle noticeable.
Eight cylinders mean eight coils and eight spark plugs. A single failure causes misfires and can damage catalytic converters. Complete set change every 30,000 km — avoid mixing brands. NGK or Bosch Iridium recommended.
Symptoms: Engine stumbling, rough idle, MIL with misfire codes, increased fuel consumption, power loss at high revs.
Exhaust manifold gaskets become brittle through thermal stress. With eight cylinders and two manifolds, 16 sealing faces are affected. Parts cost is low but labour is high due to restricted access in the V8 engine bay.
Symptoms: Ticking noise on cold start that fades at operating temperature, faint exhaust smell in engine bay, visible discolouration at manifold flanges.
Vehicle Weaknesses 6
The M-DCT gearbox is prone to oil loss through aged seals in the mechatronics unit. Regular oil changes every 40,000–60,000 km are essential for longevity.
Defective microswitches at the front roof latch send conflicting signals — the system stops as a safety measure. Common fault codes: A68E sensor windscreen frame locked, A692 Hall sensor end position.
Hydraulic cylinders in the convertible roof mechanism leak. Loss of hydraulic fluid causes the roof to stop midway during opening or closing. Replacing the cylinders is labour-intensive and expensive.
The complex roof electronics on the E93 are prone to sensor faults (Hall sensors, microswitches) and relay failures. The hydraulic system stops when a faulty sensor signal is received.
The limited-slip differential on the E93 M3 shares the weakness with the E90/E92: bearing whine. The additional weight of the convertible places greater load on the differential.
The convertible roof control module on the E93 M3 draws current continuously in sleep mode, causing complete battery discharge after extended periods of standing.
Reports & Tests
202 owner complaints filed with NHTSA (2007–2013). Most reported: Powertrain (73), Engine (54), Airbags (45).