Camshaft adjuster magnet oil leak
usually 80,000–160,000 km · Medium risk
Signs: Oil in the wiring plug — can reach the ECU
Fix: Replace magnet, check the harness
€150–600
Common faults, service intervals and costs
Mercedes-Benz SLK (R170)
1996–2004
2
engines covered
6
known faults
13,562
roadworthiness tests in the statistics
Enter your VIN and mileage and get a plan built for your exact engine and gearbox.
The Mercedes-Benz SLK (R170) was built from 1996 to 2004.
For this generation we cover 2 engines and 6 known faults, each with the mileage range where it usually appears.
The most expensive known risk is Conductor plate / speed sensor (5G / 7G-Tronic): it usually appears at 100,000–220,000 km and costs €500–1,500 to fix.
In UK roadworthiness tests in 2024, at 100–150 thousand km this model most often failed on: lights, wipers and visibility (18.4 %), suspension (8.9 %), brakes (7.8 %). It fails less often than average on: brakes, suspension, body and corrosion, exhaust, emissions and leaks.
Engines
| Engine | Fuel | Timing drive | Oil |
|---|---|---|---|
| 1.8 / 2.0 / 2.3 petrol incl. Kompressor (Mercedes M111) | Petrol | Chain | 5W-40 / 10W-40 · MB 229.1 / 229.3 · every 15,000 km |
| V6 / V8 petrol (Mercedes M112 / M113) | Petrol | Chain | 5W-40 / 0W-40 · MB 229.3 / 229.5 · every 15,000 km |
Faults by engine
1.8 / 2.0 / 2.3 petrol incl. Kompressor (Mercedes M111)
Crankcase breather hoses
usually 100,000–200,000 km · Wear part
Signs: Oil leaks, whistle
Fix: Replace hoses
€100–300
Oil leaks (cylinder head cover / timing cover)
usually 150,000–300,000 km · Wear part
Signs: Oil smell, oil on the engine
Fix: Replace the gaskets
€100–350
V6 / V8 petrol (Mercedes M112 / M113)
Camshaft adjuster magnet oil leak
usually 80,000–160,000 km · Medium risk
Signs: Oil in the wiring plug — can reach the ECU
Fix: Replace magnet, check the harness
€150–600
Crankcase breather hoses
usually 100,000–200,000 km · Wear part
Signs: Oil leaks, whistle
Fix: Replace hoses
€100–300
Crankshaft pulley (harmonic balancer) separating
usually 150,000–300,000 km · Medium risk
Signs: Vibration, drive belt squeals or comes off
Fix: Replace the crankshaft pulley
€200–500
Gearboxes
Manual
Clutch wear
usually 120,000–200,000 km · Medium risk
Signs: Slipping, high bite point
Fix: Replace clutch kit
€500–900
5G / 7G / 9G-Tronic
Conductor plate / speed sensor (5G / 7G-Tronic)
usually 100,000–220,000 km · Medium risk
Signs: Stuck in gear, limp mode, harsh shifts
Fix: Replace the conductor plate; fluid every 60–100,000 km
€500–1,500
Scheduled service
Intervals and typical prices for the 1.8 / 2.0 / 2.3 petrol incl. Kompressor (Mercedes M111) engine. Other engines differ in oil, timing drive and some filters; the app gives the exact plan.
| Item | Interval | Typical price |
|---|---|---|
| Engine oil + oil filterEngine | every 15,000 km or every 12 months | €70–150 |
| Cabin (pollen) filterClimate | every 15,000 km or every 12 months | €15–40 |
| Brake fluidBrakes | every 24 months | €50–95 |
| A/C service (regas + desiccant)Climate | every 24 months | €70–150 |
| Air filterEngine | every 30,000 km or every 24 months | €15–45 |
| Spark plugsIgnition | every 60,000 km or every 48 months | €50–160 |
| Auxiliary (serpentine) beltEngine | every 120,000 km | €70–180 |
| Coolant replacementCooling | every 150,000 km or every 96 months | €70–150 |
| Timing chain inspection (listen on cold start)Engine | every 150,000 km | €0–120 |
| Manual gearbox oilTransmission | every 150,000 km | €60–130 |
| Front brake padsBrakes | usually at 30,000–60,000 km | €60–150 |
| Front brake discs + padsBrakes | usually at 60,000–120,000 km | €150–320 |
| Rear brake padsBrakes | usually at 50,000–90,000 km | €50–130 |
| Tyres (set of 4)Wheels | usually at 40,000–60,000 km | €320–700 |
| Wiper bladesBody | checked at service | €20–50 |
| 12V batteryElectrical | checked at service | €100–220 |
Roadworthiness tests by mileage
Share of tests in the United Kingdom (DVSA MOT, 2024) that this model failed because of each system. Bold red means more often and green less often than an average car of the same age and mileage. Sample: 13,562 tests.
| thousand km | 0–50 | 50–100 | 100–150 | 150–200 | 200–250 |
|---|---|---|---|---|---|
| Brakes | 2.8 % | 4.8 % | 7.8 % | 9.5 % | 12.0 % |
| Suspension | 1.5 % | 4.9 % | 8.9 % | 9.9 % | 11.2 % |
| Steering | 0.7 % | 1.1 % | 2.7 % | 2.3 % | 2.7 % |
| Tyres and wheels | 1.7 % | 3.3 % | 4.9 % | 6.5 % | 6.8 % |
| Lights, wipers and visibility | 6.8 % | 13.8 % | 18.4 % | 24.4 % | 28.7 % |
| Body and corrosion | 0.5 % | 1.0 % | 2.3 % | 4.0 % | 5.0 % |
| Exhaust, emissions and leaks | 1.2 % | 2.3 % | 4.3 % | 5.9 % | 5.9 % |
Other generations
Sources and notes
Faults, intervals and prices are indicative and collected from public sources and owner experience; always rely on the service book and a qualified workshop. Test statistics: DVSA – Anonymised MOT tests and results, Open Government Licence v3.0. Owner complaints: NHTSA ODI (public domain). Recalls: DVSA Vehicle Safety Branch Recalls Database, OGL v3.0. Brand and model names are trademarks of their owners and are used only to describe the vehicles.
Updated 07/10/2026