Mercedes Benz SLC 43 AMG Engine Replacement Compare Prices & Get Quotes

Short summary: A rebuilt M276 engine for the SLC 43 AMG costs £6,500-£9,600 supply-only. Fitting adds £1,200-£2,000 depending on complexity - AMG V6 biturbo work requires specialist knowledge.

• SLC 43 AMG (M276.823): rebuilt unit £6,500-£9,600; used engine from £2,500
• M276 timing chain tensioner replacement: £1,200-£1,800 at specialist
• M276 walnut blasting (carbon cleaning): £400-£700 at specialist

Short summary: A rattling or knocking noise on cold start lasting a few seconds is the classic warning sign on the M276 engine. The hydraulic secondary chain tensioners are a known weak point on the M276. If ignored, it can lead to chain stretch, poor timing performance, misfires and catastrophic engine failure.

• Rattling or knocking noise on cold start - earliest warning
• Poor timing performance and misfires
• Check engine light with timing correlation codes
• If caught early, tensioner replacement costs £1,200-£1,800 at specialist

Short summary: Carbon buildup on intake valves is a known issue on direct injection engines like the M276. Because fuel is injected directly into the combustion chamber, intake valves are not washed by fuel, allowing carbon deposits to accumulate over time.

• Rough idle and reduced performance
• Poor fuel economy
• Regular intake valve cleaning (walnut blasting) is recommended
• If caught early, cleaning costs £400-£700 at specialist

Short summary: The M276 is a hand-built AMG performance engine - powerful and refined, but it has known weaknesses. Timing chain tensioner wear, carbon buildup, turbocharger issues, and PCV system failures are the most common problems. Generally a durable, refined engine - 200,000+ km examples are common - but has well-documented weak points. With these addressed and regular maintenance, the engine is capable of 150,000+ miles.

• M276 is fundamentally strong with proper maintenance
• Timing chain tensioner wear is the most critical issue - early intervention is key
• Carbon buildup is a maintenance item on direct injection engines
• Regular oil changes with Mercedes-spec oil are essential

Short summary: Properly maintained M276 engines routinely reach 150,000-200,000 miles before major work. Timing chain issues typically appear between 50,000-90,000 miles.

• M276 (SLC 43 AMG): 150,000-200,000 miles with regular servicing
• Timing chain tensioner inspection recommended from 50,000 miles
• Carbon cleaning recommended from 40,000-60,000 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 M276 costs £6,500-£9,600 - far less than replacing a £18,000-£35,000 vehicle. SLC 43 AMG values remain strong for well-maintained examples, making engine replacement a worthwhile investment.

• SLC 43 AMG values: £18,000-£35,000 depending on condition and mileage
• Rebuilt engine with upgraded components fixes original weak points
• Supply & fit typically £7,700-£11,600 depending on engine code
• New engine includes 12-month unlimited mileage warranty