Mercedes Benz SLC 180/200 Engine Replacement Compare Prices & Get Quotes

Short summary: A rebuilt M274 engine for the SLC 180 costs £3,200-£4,400 supply-only; a rebuilt M274 engine for the SLC 200 costs £3,400-£5,200 supply-only. Fitting adds £800-£1,200 depending on complexity - modern turbocharged work requires specialist knowledge.

• SLC 180 (M274.910): rebuilt unit £3,200-£4,400; used engine from £1,200
• SLC 200 (M274.920): rebuilt unit £3,400-£5,200; used engine from £1,300
• M274 timing chain tensioner replacement: £950-£1,250 at specialist
• M274 thermostat replacement: £350-£650 at specialist

Short summary: A rattling noise on cold start is the classic warning sign on the M274 engine. The timing chain tensioner can lose hydraulic pressure, allowing chain slack and guide wear. If ignored, it can lead to catastrophic engine failure.

• Rattling noise on cold start lasting 1-3 seconds - earliest warning
• Check engine light with timing correlation codes
• Metallic debris in the engine oil (severe cases)
• If caught early, tensioner replacement costs £950-£1,250 at specialist

Short summary: One of the most prevalent issues with the M274 engine is excessive oil consumption. A class action lawsuit has alleged a piston defect causing premature failure in M274 engines. Worn piston rings can also allow oil to bypass into the combustion chambers.

• Oil consumption between services - monitor levels regularly
• Blue smoke from the exhaust on cold starts
• Check engine light with misfire codes
• If caught early, piston ring replacement costs £2,400-£3,600 at specialist

Short summary: The M274 engine is a modern, efficient turbocharged four-cylinder, but it has known issues. Timing chain tensioner wear, thermostat failure, and piston ring wear are the most common problems. With these addressed, the engine is capable of 100,000+ miles.

• M274 is generally reliable with regular maintenance
• Timing chain tensioner wear is the most critical issue
• Thermostat failure is common and costly to repair
• Piston ring wear and oil consumption are well-documented
• Regular oil changes with MB 229.5 spec oil are essential

Short summary: Properly maintained M274 engines routinely reach 150,000-200,000 miles before major work. Timing chain tensioner issues typically appear between 45,000-80,000 miles.

• M274 (SLC 180/200): 150,000-200,000 miles with regular servicing
• Timing chain tensioner inspection recommended from 45,000 miles
• Thermostat replacement may be needed from 50,000 miles
• Service interval is 10,000 miles or 12 months - use Mercedes-spec MB 229.5 oil

Short summary: Yes, if the SLC is otherwise in good condition with no rust or major transmission faults. A rebuilt M274 costs £3,200-£5,200 - far less than replacing a £12,000-£25,000 vehicle. SLC values remain strong for well-maintained examples, making engine replacement a worthwhile investment.

• SLC 180/200 values: £12,000-£25,000 depending on condition and mileage
• Rebuilt engine with upgraded components fixes original weak points
• Supply & fit typically £4,000-£6,400 depending on engine code
• New engine includes 12-month unlimited mileage warranty