Mercedes Benz GLE Class 250d/300d Engine Replacement Compare Prices & Get Quotes

Short summary: A rebuilt OM651 engine for the GLE 250d costs £2,500-£3,200 supply-only; a rebuilt OM654 engine for the GLE 300d costs £2,800-£3,800 supply-only. Fitting adds £800-£1,500 depending on complexity.

• GLE 250d (OM651): rebuilt unit £2,500-£3,200; used engine from £1,200
• GLE 300d (OM654): rebuilt unit £2,800-£3,800; used engine from £1,500
• OM651 timing chain kit (labour only): £700-£1,200 at specialist
• OM654 EGR cooler replacement: £500-£750 at specialist

Short summary: A rattling noise on cold start is the classic warning sign on the OM651 engine. If ignored, it can lead to misfires, cam/crank correlation codes, and catastrophic engine damage if the chain jumps a tooth.

• Cold start rattle that disappears after oil pressure builds - earliest warning
• Check engine light with cam/crank correlation codes
• Metallic swarf in engine oil indicates chain guides wearing away
• Preventative tensioner replacement costs £300-500 - full chain kit £700-1,200

Short summary: The OM654 is a modern, efficient diesel with strong performance. However, it has a known EGR system weakness - clogging and cooler failures that can occur from 50,000 miles. With proper maintenance and EGR attention, these engines exceed 150,000 miles.

• EGR valve and cooler clogging is the dominant issue
• EGR cooler leaks can cause coolant loss
• Rough idle and hesitation are classic symptoms
• Well-maintained OM654 engines exceed 150,000 miles

Short summary: Properly maintained OM651 engines routinely reach 150,000-200,000 miles (200,000-300,000 km) before major work. The OM654 is too new for definitive long-term data, but early indications suggest similar longevity with proper maintenance.

• OM651 (250d): 150,000-200,000+ miles with regular servicing
• OM654 (300d): too early for definitive data - EGR issues from 50k miles
• Service interval is 10,000 miles or 12 months - use Mercedes-spec low-SAPS oil
• Late oil changes accelerate timing chain wear on OM651 and EGR clogging on OM654

Short summary: Yes, if the GLE is otherwise in good condition with no rust or major electrical faults. A rebuilt OM651 costs £2,500-£3,200 - far less than replacing a £12,000-£20,000 vehicle. The GLE 300d's higher value (£25,000-£45,000) makes replacement even more financially justifiable.

• GLE 250d values: £12,000-£20,000 depending on year, mileage and condition
• GLE 300d values: £25,000-£45,000 - premium SUV residual values remain strong
• Rebuilt engine with upgraded components fixes original weak points
• Supply & fit typically £3,500-£5,500 depending on engine code
• New engine includes 12-month unlimited mileage warranty

Short summary: Mercedes-Benz specifies low-SAPS oil meeting MB 229.51 or 229.52 - typically 5W-30. The OM651 requires approximately 6.5 litres; the OM654 requires approximately 7 litres.

• OM651 (250d): MB 229.51/229.52 5W-30 low-SAPS - protects DPF and emissions systems
• OM654 (300d): MB 229.52 5W-30 low-SAPS - 7L capacity
• Never use non-approved oil - destroys timing chain tensioners and hydraulic lifters
• Change every 10,000 miles or 12 months - stretched intervals cause timing chain wear and EGR clogging