Mercedes R Class M272/OM642 Engine Solutions - UK Specialists

Key points

• OM642.950 diesel engines for R320 CDI average £2,800-£4,600 rebuilt supply-only
• M272.967 petrol engines for R350 typically cost £2,500-£4,500 reconditioned
• Supply-and-fit labour adds £800-£1,500 depending on workshop location and 4MATIC complexity
• Used engines start around £1,500 but carry higher risk without comprehensive warranty
• Always request written warranty confirmation covering parts and labour for minimum 12 months

Key points

• Mercedes Benz R Class values range £3,000-£8,000 depending on year, mileage and specification
• Rebuilt OM642 diesel engines cost £2,800-£4,600 supply-only from UK specialists
• Factor in £800-£1,500 supply-and-fit labour when calculating total replacement investment
• A quality rebuilt engine with warranty can extend vehicle life by 50,000+ miles
• Consider scrappage if bodywork, suspension or transmission also need major investment

Key points

• OM642 rear timing chain tensioner loses hydraulic pressure after 80,000 miles on R Class
• Plastic guide fragments from chain stretch can enter oil sump causing catastrophic secondary damage
• Missed oil changes or using incorrect specification oil accelerates OM642 timing component wear
• Cold-start rattling between 900-1,200rpm is the key early warning symptom for R Class owners

Key points

• Pre-2007 M272 petrol engines in R350 suffer terminal balance shaft sprocket wear around 70,000 miles
• Post-2009 OM642 diesel engines benefit from revised tensioners reducing timing chain failure risk on R Class
• OM642 oil cooler seal leaks remain a labour-intensive repair regardless of diesel or petrol R Class variant
• R500 V8 M113 and M273 units offer robust reliability but command premium replacement costs for Mercedes Benz R Class

Key points

• Quality OM642 rebuilds include upgraded tensioners, guides and oil cooler seals for Mercedes Benz R Class
• Adhering to 10,000-mile oil change intervals using MB 229.51 specification oil extends rebuilt engine lifespan
• Rebuilt OM642 engines from EngineMarket specialists carry minimum 12-month unlimited mileage warranty coverage
• Avoid short-journey driving patterns that accelerate DPF and EGR system wear on rebuilt R Class diesel engines

Key points

• Used OM642 engines for Mercedes Benz R Class typically cost £1,500-£2,800 supply-only from UK breakers
• Always request compression test results and service history documentation before purchasing a used R Class engine
• Reconditioned engines include new gaskets, seals and upgraded timing components resolving original Mercedes Benz R Class weaknesses
• Used engines rarely include warranty coverage beyond 30-90 days versus 12 months on reconditioned R Class units

Key points

• EngineMarket network specialists provide minimum 12-month unlimited mileage warranty on all Mercedes Benz R Class rebuilt engines
• Warranty coverage typically includes parts and labour for engine-related failures during the protection period
• Always request written warranty documentation specifying inclusions, exclusions and claim procedures for your R Class engine
• Supply-and-fit installations often extend warranty coverage to include fitting labour unlike supply-only engine purchases

Key points

• Mercedes Benz R Class engine codes are stamped on the engine block near the cylinder head
• The V5C registration document lists your engine code in section D.2 for Mercedes Benz R Class vehicles
• Enter your registration on EngineMarket to instantly identify your R Class engine code and compatible replacements
• OM642 variants include .950, .870, .872 and LS suffixes denoting power output for different R Class models

Key points

• OM642 diesel engines in Mercedes Benz R Class share core design with ML320 CDI and M-Class W164 variants
• Engine mounting brackets, wiring harnesses and ECU software differ between Mercedes Benz R Class and ML-Class applications
• Using an ML-Class donor engine in an R Class requires specialist adaptation of mounts and electronics
• Always match engine code suffixes precisely when sourcing replacement units for Mercedes Benz R Class W251 chassis

Key points

• Mercedes Benz R Class engine fitting requires specialists familiar with W251 chassis access and 4MATIC system procedures
• EngineMarket vets all network specialists for Mercedes Benz R Class experience and warranty-backed installation standards
• Supply-and-fit quotes typically add £800-£1,500 to engine price depending on workshop location and R Class variant complexity
• Always confirm the quote includes ECU adaptation and road testing after Mercedes Benz R Class engine installation