Mercedes Benz SLK 200/230 Kompressor Engine Replacement Compare Prices & Get Quotes

Short summary: A rebuilt M111 engine for the SLK 200 or 230 Kompressor costs £2,000-£3,400 supply-only; a rebuilt M271 engine for the R171 SLK 200 Kompressor costs £2,400-£3,600 supply-only. Fitting adds £800-£1,500 depending on complexity - supercharged engine work requires specialist knowledge.

• SLK 200 Kompressor (M111.943): rebuilt unit £2,000-£3,000; used engine from £800
• SLK 230 Kompressor (M111.973): rebuilt unit £2,200-£3,200; used engine from £900
• SLK 230 Kompressor (M111.983): rebuilt unit £2,300-£3,400; used engine from £1,000
• SLK 200 Kompressor (M271.944): rebuilt unit £2,200-£3,400; used engine from £1,000
• M111 head gasket replacement: £900-£1,600 at specialist
• M271 timing chain replacement: £1,200-£1,800 at specialist

Short summary: Coolant loss, overheating, white smoke from the exhaust, and oil in the coolant are the classic warning signs on the M111 engine. The original Victor Reinz fibre head gasket can fail with age, particularly between cylinders 3 and 4.

• Coolant loss without visible external leaks
• Engine overheating or temperature gauge fluctuation
• White smoke from the exhaust
• Oil in the coolant or coolant in the oil
• Bubbles in the radiator or expansion tank
• If caught early, head gasket replacement costs £900-£1,600 at specialist

Short summary: A rattling noise on cold start is the classic warning sign on the M271 engine. The timing chain can stretch over time, especially on earlier models, and the plastic timing chain guides can wear down.

• Rattling noise on cold start lasting 1-3 seconds - earliest warning
• Check engine light with cam/crank correlation codes
• Rough idle or poor acceleration
• Metallic debris in the oil (severe cases)
• If caught early, timing chain replacement costs £1,200-£1,800 at specialist

Short summary: The M111 engine is widely regarded as very solid and reliable, with the head gasket being the main weakness. The M271 engine has a reputation for timing chain issues, but otherwise is a reliable powerplant.

• M111 is considered a robust and reliable engine
• M111 head gasket failure is the most significant weakness
• M271 timing chain stretch is the main concern - early intervention is key
• Regular oil changes with correct spec oil are essential for both engines

Short summary: Properly maintained M111 engines routinely reach 150,000-200,000 miles before major work. The M271 can achieve similar mileage but may require timing chain attention between 60,000-100,000 miles.

• M111 (SLK 200/230 Kompressor): 150,000-200,000 miles with regular servicing
• M271 (SLK 200 Kompressor): 150,000-200,000 miles - timing chain inspection from 60k miles
• Head gasket inspection recommended from 80,000 miles on M111
• Service interval is 10,000 miles or 12 months - use Mercedes-spec MB 229.5 oil

Short summary: Yes, if the SLK is otherwise in good condition with no rust or major transmission faults. A rebuilt M111 costs £2,000-£3,400 - far less than replacing a £3,000-£12,000 vehicle. Classic SLK values remain strong for well-maintained examples, making engine replacement a worthwhile investment.

• SLK 200/230 Kompressor values: £3,000-£12,000 depending on condition and mileage
• Rebuilt engine with upgraded components fixes original weak points
• Supply & fit typically £2,800-£5,000 depending on engine code
• New engine includes 12-month unlimited mileage warranty