Mercedes Benz Sprinter 209/219/309/319 CDI Engine Replacement Compare Prices & Get Quotes

Short summary: A rebuilt OM646 engine for the Sprinter 209 CDI costs £2,600-£3,600 supply-only; a rebuilt OM642 V6 engine for the Sprinter 319 CDI costs £4,200-£6,000 supply-only. Supply-and-fit adds £450-£850 labour depending on complexity - V6 work requires specialist knowledge.

• Sprinter 209/309 CDI (OM646.984): rebuilt unit £2,600-£3,600; used engine from £1,200
• Sprinter 319/419/519 CDI (OM642.896/898): rebuilt unit £4,200-£6,000; used engine from £1,800
• OM642 oil cooler seal replacement (labour only): £1,200-£1,800 at specialist
• OM646 injector seal replacement: £150-£250 per injector at specialist

Short summary: Diesel fumes in the cabin and carbon buildup around the injectors are the classic warning signs on the OM646 engine. The copper sealing washers fail over time, allowing combustion gases to escape ("Black Death"). If ignored, injectors can seize in the head.

• Diesel smell in the cabin - first warning sign
• Carbon crust ("Black Death") around the injector body
• Tapping or chuffing sound from the injector area
• If caught early, resealing costs £150-£250 per injector

Short summary: A burning oil smell from the engine bay or oil pooling in the V of the engine is the classic warning sign on the OM642 V6. The seals are located under the intake manifold and require significant labour to replace.

• Burning oil smell from the engine bay
• Oil pooling in the valley between V6 cylinder banks
• Oil dripping onto the exhaust system
• If caught early, Viton seal replacement costs £1,200-£1,800 at specialist

Short summary: The OM642 V6 is a fundamentally strong and refined engine, found across Mercedes' commercial and passenger vehicle ranges. However, it has well-documented weak points: oil cooler seal degradation, turbocharger oil seal failure, and injector cup leaks. With upgraded Viton seals and regular maintenance, these engines routinely exceed 150,000 miles.

• OM642 is fundamentally robust with proven durability
• Oil cooler seal degradation is the dominant failure - £10 part, £1,200 labour
• Turbocharger oil seal failure causes blue smoke and oil consumption
• Well-maintained OM642 engines exceed 150,000 miles

Short summary: Properly maintained OM646 engines routinely reach 150,000-200,000 miles before major work. The OM642 V6 can achieve similar mileage but may require oil cooler seal attention between 80,000-130,000 miles.

• OM646 (209/309 CDI): 150,000-200,000 miles with regular servicing
• OM642 (319 CDI): 150,000-200,000 miles - oil cooler seals from 80k miles
• Service interval is 10,000 miles or 12 months - use Mercedes-spec low-SAPS oil
• Late oil changes accelerate oil cooler seal degradation and turbo wear

Short summary: Yes, if the Sprinter is otherwise in good condition with no structural rust or major transmission faults. A rebuilt OM646 costs £2,600-£3,600 - far less than replacing a £3,000-£8,000 vehicle. The OM642's higher value (£5,000-£15,000) makes replacement even more financially justifiable.

• Sprinter 209/309 CDI values: £3,000-£8,000 depending on condition
• Sprinter 319 CDI values: £5,000-£15,000 - V6 variants retain strong values
• Rebuilt engine with upgraded components fixes original weak points
• Supply & fit typically £3,000-£6,850 depending on engine code
• New engine includes 12-month unlimited mileage warranty