Mercedes-Benz SLK R170
Weaknesses, engine ratings and buying advice
Generations
Engine Overview
The Mercedes-Benz SLK R170 is available with 5 engine variants — from 121 to 354 hp. 2 variants had engine changes — the model year is crucial.
The Mercedes-Benz SLK 200 (Benziner, 136 PS) has the M111 (2.0-2.3L) — rated: "Be Careful", 6 known weaknesses.
The Mercedes-Benz SLK 200 Kompressor (Benziner, 163–192 PS) comes with 2 different engines: M111 (1996–2000, Be Careful) und M111 (2000–2004, Be Careful). Pay attention to the model year for the SLK 200 Kompressor!
The Mercedes-Benz SLK 230 Kompressor (Benziner, 193–197 PS) comes with 3 different engines: M111 (1996–2000, Be Careful) und M111 (1996–2000, Be Careful) und M111 (2000–2004, Be Careful). Pay attention to the model year for the SLK 230 Kompressor!
The Mercedes-Benz SLK 32 AMG (Benziner, 354 PS) has the M112 (3.2L V6) — rated: "Be Careful", 7 known weaknesses.
The Mercedes-Benz SLK 320 (Benziner, 218 PS) has the M112 (3.2L V6) — rated: "Be Careful", 7 known weaknesses.
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| Vario roof hydraulics leaking Vario roof hydraulic cylinders develop leaks and the roof no longer opens or closes fully. Opening time over 28 seconds indicates hydraulic loss. Specialist repair required. Symptoms: Roof sticks, opening sequence takes over 28 seconds, hydraulic oil in boot from 100,000 km | Medium | |
| Roof hydraulic cylinders: O-rings and rod seals leaking O-rings and rod seals wear in temperature extremes, particularly in summer. Complete replacement at Mercedes over 8,000 EUR; seal kit repair significantly cheaper. Symptoms: Hydraulic oil escapes at rollover bars or boot lid. Roof opens progressively more slowly. System loses pressure. from 80,000 km | Medium | |
| Drain channels blocked: water in boot and interior The four water drainage channels block with leaves and dirt. The thin-walled original hoses kink at the pass-through point. Boot lid seal replacement approximately 500 EUR per side. Symptoms: Water in boot after rain. Misted windows. Wet carpet. When flushed, only a trickle instead of a jet. from 80,000 km | Medium | |
| Water ingress into doors and roof area Roof frame and door seals become porous; water enters the door cards. Damp interior encourages rust in the underbody. Seat squeaking and poor door closure are common. Symptoms: Wet door cards after rain, squeaking seats, mould smell in interior from 100,000 km | Low |
Alternatives
BMW Z4 E85
Cabrio/Roadster (2002–2008)
Mazda MX-5 NB
Cabrio/Roadster (1998–2005)
BMW Z3 M E36/7
Cabrio/Roadster (1996–2002)
Porsche Boxster 986
Cabrio/Roadster (1996–2004)
Volvo C70 I
Cabrio/Roadster (1996–2005)
Alfa Romeo Spider 916
Cabrio/Roadster (1995–2006)
Known Problems and Issues
A total of 22 weaknesses have been documented for the Mercedes-Benz SLK R170 (1996–2004) — 13 engine-related and 9 vehicle-related. Typical issues affect Body, Rust, Gearbox, Suspension.
SLK (M111, 1996–2000) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 136 PS.
SLK (M111, 1996–2000) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 192 PS.
SLK (M111, 1996–2000) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 193–197 PS.
SLK (M111, 2000–2004) — Be Careful: Head Gasket Ages and Leaks, Supercharger Magnetic Clutch Fails, Ignition Coils Wear Out Due to Neglected Spark Plugs. Power: 163 PS.
SLK (M112, 2000–2004) — Be Careful: Camshaft Adjuster Leaks Oil into Wiring Harness, Intake Manifold Vacuum Hose Breaks, Valve Cover Gasket and Front Cover Gasket Leaking. Power: 218 PS.
SLK (M112, 2001–2004) — Be Careful: Camshaft Adjuster Leaks Oil into Wiring Harness, Intake Manifold Vacuum Hose Breaks, Valve Cover Gasket and Front Cover Gasket Leaking. Power: 354 PS.
What to watch out for with the Mercedes-Benz SLK? See the detailed listing of all engine and vehicle weaknesses in the sections above.
Frequently Asked Questions
What problems and weaknesses does the Mercedes-Benz SLK R170 have? +
What should I look for when buying a used Mercedes-Benz SLK R170? +
Which engine is recommended? +
Which Mercedes-Benz SLK R170 engine is the most fun? +
Is the Mercedes-Benz SLK R170 worth buying used? +
What horsepower variants are available for the Mercedes-Benz SLK R170? +
Last updated: February 2026 · All information without guarantee