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Mercedes-Benz OM606 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The OM606 is Mercedes-Benz’s legendary 3.0-litre inline-6 pre-chamber diesel, the final evolution of the mechanical indirect-injection era, fitted to the W124, W140, and G-Class. Reconditioned OM606 engines typically start from £1,800 , and while request volumes are lower than modern diesels, it remains a highly sought-after unit for classic Mercedes restorations and commercial G-Class rebuilds.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£600
Reconditioned from
£1,800
Rebuilt from
£3,000
GB
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Key Specs
Mercedes-Benz OM606 - Specifications at a Glance
Engine Code
OM606 (including OM606.910, OM606.960, OM606.962)
Fuel
Diesel
Configuration
3.0L inline-6, SOHC, 12-valve, pre-chamber
Power Output(s)
96 kW (130 hp) - 130 kW (177 hp)
Years Produced
1993-2001
UK Models Fitted
3 Mercedes model families - full list in Compatibility below
Replaced
OM603
Replaced By
OM613
Most Common Failure
High-mileage timing chain stretch and injector seal weeping
Reconditioned Price Range
£1,800-£2,800 supply-only
Vetted UK specialists for OM606 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Mercedes Models Use the OM606-
The OM606 was the definitive 6-cylinder diesel for Mercedes-Benz’s flagship and off-road lineup throughout the 1990s, bridging the gap between the mid-size E-Class, the luxury S-Class, and the utilitarian G-Class.
02
Mercedes-Benz S-Class
03
Mercedes-Benz G-Class
CROSS-BRAND
OM606 is documented across 3 BMW applications spanning E-Class, S-Class, G-Class. Registration lookup confirms the exact suffix before quotes are sent.
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Not sure which engine your car has- Enter your registration above - we'll confirm your exact OM606 fitment before any quotes are sent.
Prices
Mercedes-Benz OM606 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £600-£1,200 | £1,300-£2,200 | 3-6 months |
Reconditioned | £1,800-£2,800 | £2,700-£4,000 | 12-24 months |
Rebuilt | £3,000-£4,500 | £4,200-£6,000 | 12-24 months |
What genuinely moves the price for this engine is whether it is a naturally aspirated or turbocharged variant, and the condition of the mechanical Bosch injection pump. Because the OM606 is a 6-cylinder pre-chamber diesel, recon specialists often upgrade the glow plug system, vacuum pump, and injector seals as standard. For a full breakdown of market rates, see our full reconditioned engine cost guide.
Labour Guide
Fitting an OM606 engine typically takes 12-16 hours at £65-£85/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Mercedes-Benz OM606 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the OM606, based on real-world data and verified failure patterns.
Verified issue focus: High-mileage timing chain stretch and injector seal weeping.
1. Timing Chain Stretch and Guide Wear - All variants
1. Timing Chain Stretch and Guide Wear - All variants
Typical onset:
150,000+ miles
What happens:
The duplex timing chain and plastic guide rails can stretch and wear over high mileage, leading to a distinct rattling noise on cold starts. If ignored, the chain can jump a tooth, causing valve-to-piston contact and catastrophic engine failure.
Repair vs replace:
If caught early, a timing chain and guide kit replacement is straightforward and cost-effective. If the engine has already suffered valve damage, a full reconditioned unit is the only viable path.
Read more about this issue
2. Injector Seal Weeping ("Black Death") - All variants
2. Injector Seal Weeping ("Black Death") - All variants
Typical onset:
100,000+ miles
What happens:
The copper washer seals at the base of the injectors degrade over time, allowing combustion gases to escape. This creates a black, crusty carbon buildup around the injector heads and can lead to difficult cold starts or rough idling.
Repair vs replace:
This is a routine maintenance item, not a terminal failure. Replacing the seals and cleaning the cylinder head is inexpensive and should be done preventatively.
Read more about this issue
3. Head Gasket Failure - .960 and .962 turbocharged variants
3. Head Gasket Failure - .960 and .962 turbocharged variants
Typical onset:
120,000+ miles
What happens:
The turbocharged OM606 variants generate significantly higher cylinder pressures and heat. Over time, the head gasket can fail, leading to coolant loss, overheating, and combustion gases entering the cooling system.
Repair vs replace:
If caught before the cylinder head warps, a head gasket replacement is viable. If the head has warped or the block is damaged, a full reconditioned or rebuilt unit is required.
Read more about this issue
The OM606 is widely regarded as one of Mercedes’ most robust inline-6 diesels, offering a significant refinement and power step up from the OM603 it succeeded. Units maintained with regular oil changes routinely exceed 300,000 miles without major internal issues .
Compare rebuilt OM606 engine prices with the failure already addressed
Engine Variants
OM606 Sub-Codes Explained - Which One Is in Your Car-
INTRO: The OM606 family shares the same fundamental 3.0L inline-6 block and pre-chamber head design, but forced induction and tuning vary depending on the chassis. Identifying your exact sub-code ensures you order the correct injection pump, turbo, and ancillary components. - Fitted to: E-Class W124 (E 300 D), S-Class W140 (S 300), G-Class W463 (G 300 GD) - Key technical difference: The base naturally aspirated variant, featuring a simpler ancillary layout without turbo plumbing and a mechanical Bosch PES injection pump calibrated for lower output. - Sub-code-specific failure note: Shares the family failure pattern above; no unique widespread defects beyond standard high-mileage wear. - Interchange note: Not a straight swap with the turbo variants; the injection pump, exhaust manifold, and oil return lines differ significantly. - Fitted to: E-Class W124 (E 300 TD), S-Class W140 (S 350 TD), G-Class W463 (G 350 TD) - Key technical difference: Adds a turbocharger and intercooler to the 3.0L block, requiring a higher-capacity mechanical injection pump, revised piston cooling jets, and an upgraded cooling system to handle the additional heat. - Sub-code-specific failure note: Shares the family failure pattern above; turbocharger shaft wear and head gasket failure under boost are the primary additional wear items. - Interchange note: Can be swapped with the .910 block, but requires the complete turbo kit, different injection pump, and revised engine management linkages. - Fitted to: S-Class W140 (late S 350 TD), G-Class W463/W461 (late G 350 TD) - Key technical difference: A later revision of the turbocharged architecture, featuring updated emissions calibration, revised vacuum pump orientation, and specific accessory brackets for the later W140 and W461 commercial/military chassis. - Sub-code-specific failure note: Shares the family failure pattern above; vacuum pump leaks are slightly more prevalent on this specific revision due to the revised mounting angle. - Interchange note: Directly interchangeable with the .960 in most passenger car applications, provided the injection pump and vacuum pump are swapped to match the original chassis specification.
The engine code is stamped on the right-hand side of the cylinder block, just above the oil filter housing. It will also be listed on your V5C logbook under "Engine Capacity" or visible via a VIN decode. Not sure- Enter your registration above for instant confirmation.
Easily Confused
OM603
the 3.0L inline-6 pre-chamber diesel that the OM606 evolved from, sharing the same robust mechanical injection principles but with slightly lower output and older block architecture.
Alternative / Next-Gen Code
OM613
the modern common-rail CDI successor that eventually replaced the OM606 family, featuring electronic injection for significantly higher output, efficiency, and emissions compliance.
Related JLR Variants
OM605
the 2.5L inline-6 variant that shares the same pre-chamber diesel philosophy, timing chain layout, and mechanical injection principles, but in a smaller displacement configuration for mid-size chassis.
Confirm the exact OM606 fitment
The engine code is stamped on the right-hand side of the cylinder block, just above the oil filter housing. It will also be listed on your V5C logbook under "Engine Capacity" or visible via a VIN decode. Not sure- Enter your registration above for instant confirmation.
Buying Guide
Buying a Replacement OM606 Engine - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used OM606 engine makes sense only if it comes with verifiable service history and a recent timing chain guide inspection. Given the age of these vehicles, the primary risk is hidden corrosion or degraded rubber seals, so a compression test is mandatory before purchase.
Reconditioned:
A proper reconditioned OM606 engine is the sweet spot for most buyers. A reputable rebuild will address the common failure points by fitting a new timing chain guide kit, updated injector seals, and a refreshed mechanical injection pump, giving the engine a fresh lease on life.
Rebuilt:
A full OM606 engine rebuild is justified for high-mileage G-Class applications or classic W140 restorations where originality and maximum longevity are required. An upgraded rebuild should include line-boring the block, new pistons/rings, and a balanced crankshaft.
Supply & Fit Line:
Sourcing and fitting through our vetted network ensures your OM606 engine is installed by specialists familiar with classic Mercedes mechanical diesels, backed by a nationwide warranty.
Vehicle Value Note:
Because the OM606 is typically found in vehicles valued between £2,000 and £10,000 for standard examples (though classic low-mileage W140 and G-Class models can command much higher premiums), a full replacement can represent a significant portion of the car's worth. If the lowest viable replacement cost exceeds approximately 60% of the vehicle's current market value, evaluate scrap value before committing .
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Related Engines
Engines Related to the Mercedes-Benz OM606
Explore engines that are closely related to the Mercedes-Benz OM606, including its predecessor, successor, and key family variants.
Predecessor
OM603
the 3.0L inline-6 pre-chamber diesel that the OM606 evolved from, sharing the same robust mechanical injection principles but with slightly lower output and older block architecture.
Successor
OM613
the modern common-rail CDI successor that eventually replaced the OM606 family, featuring electronic injection for significantly higher output, efficiency, and emissions compliance.
Sibling
OM605
the 2.5L inline-6 variant that shares the same pre-chamber diesel philosophy, timing chain layout, and mechanical injection principles, but in a smaller displacement configuration for mid-size chassis.
FAQ
Mercedes-Benz OM606Frequently Asked Questions
Question 1How much does a Mercedes OM606 engine replacement cost-
A reconditioned Mercedes OM606 engine typically costs between £1,800 and £2,800 for supply only . Fitted costs generally range from £2,700 to £4,000 depending on the specialist, while used units can be found from £600 but carry higher risk due to the engine's age. Compare OM606 engine replacement quotes today
Compare OM606 quotesQuestion 2What is the most common failure on the OM606 engine-
The most documented issues are timing chain stretch and plastic guide rail wear, alongside injector seal weeping ("Black Death") and head gasket failure on the turbocharged .960 and .962 variants. Timing chain rattle on cold starts is the primary warning sign, which can lead to catastrophic valve damage if ignored, whereas injector seal failure causes black carbon buildup but is a cheap and routine fix. Get quotes for a rebuilt OM606 with these issues resolved
Compare OM606 quotesQuestion 3Which Mercedes models use the OM606 engine-
The OM606 was fitted to the W124 E-Class (E 300 D, E 300 TD), the W140 S-Class (S 300, S 350 TD), and the W463/W461 G-Class (G 300 GD, G 350 TD), serving as the definitive 6-cylinder diesel for these premium and off-road chassis throughout the 1990s. Check your registration to confirm your exact OM606 fitment
Compare OM606 quotesQuestion 4Should I buy a used or reconditioned OM606 engine-
A reconditioned OM606 is strongly recommended over a used unit due to the age of these vehicles. A proper rebuild will replace the timing chain, plastic guide rails, tensioner, and injector seals, eliminating the most common failure points, whereas used engines may appear cheaper upfront but often hide stretched chains that will fail shortly after installation. Compare reconditioned OM606 engine prices from UK specialists
Compare OM606 quotesQuestion 5What is the difference between OM606.910, .960, and .962-
The OM606.910 is the 3.0L naturally aspirated variant, the OM606.960 is the 3.0L turbocharged version requiring a higher-capacity mechanical injection pump and upgraded cooling, and the OM606.962 is a later turbocharged revision with updated emissions calibration and revised vacuum pump orientation for later W140 and W461 chassis. Enter your reg above to identify your exact OM606 sub-code ═══════════════════════════════════════
Compare OM606 quotesCompare Mercedes-Benz OM606 Engine Prices Today
Vetted UK specialists who work on classic Mercedes mechanical diesels like the OM606 every week Minimum 12-month warranty on every reconditioned and rebuilt OM606 engine Nationwide delivery - supply-only or full supply & fit available across the UK Get a free, no-obligation comparison of OM606 engine prices tailored to your exact sub-code. Our registration lookup confirms your fitment before any quotes are sent, ensuring you receive the correct unit with matching ancillary components. With reconditioned OM606 engines starting from an estimated £1,800, comparing takes two minutes and could save you hundreds on labour and unexpected parts.
Vetted UK Specialists
Vetted UK specialists for OM606 replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
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