Engines Market

Mercedes Benz G 350 / G 500 Specialists

Mercedes Benz G Class G 350 / G 500 (Older Petrol) Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz G Class G 350 and G 500 petrol engine specialists. Compare prices on reconditioned, rebuilt and used M112 V6 and M113 V8 engines - supply & fit available nationwide.

Supply & Fit Available
12-Month Warranty
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Mercedes Benz G Class G 350 / G 500 (Older Petrol) Engine
from£3,800 to £6,800
  • Usedfrom £1,500
  • Reconditionedfrom £3,200
  • Common codesM112.945, M113.962
Mercedes Benz g-class G 350 / G 500 (Older Petrol) Used Engine — M112.945Mercedes Benz g-classUsed Engine — M112.945Mercedes Benz g-class G 350 / G 500 (Older Petrol) Reconditioned Engine — M112.945Mercedes Benz g-classReconditioned Engine — M112.945Mercedes Benz g-class G 350 / G 500 (Older Petrol) Rebuilt Engine — M112.945Mercedes Benz g-classRebuilt Engine — M112.945

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Mercedes Benz G Class G 350 / G 500 (Older Petrol) Engine History & Specs at a Glance

The Mercedes Benz G Class G 350 and G 500 petrol models represent the classic V6 and V8-powered W463 generation that defined the G-Class as a luxury off-roader throughout the 1990s and 2000s - from the 3.2-litre M112 V6 in the G 320 through to the 5.0-litre M113 V8 in the G 500.

Mercedes Benz G Class G 350 / G 500 (Older Petrol)
  1. 1993

    500 GE launched as limited-edition V8 (446 units worldwide), M117 5.0L V8, 240hp

  2. 1998

    G 500 launched with M113 5.0L V8, 296hp, 5-speed automatic

  3. 1998

    2005 - G 320 offered with M112 3.2L V6, 215hp, 5-speed automatic

  4. 2004

    2012 - G 55 AMG introduced alongside G 500, M113K supercharged 5.4L V8 (covered on dedicated AMG page)

Every petrol engine fitted to the Mercedes Benz G Class G 350 and G 500 range is covered below, with UK rebuilt pricing and known failure points from real owner experience.

Engine Codes & Pricing

Mercedes Benz G Class G 350 / G 500 (Older Petrol) Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

M112.945 — 3.2L V6 Petrol (1998-2005) engine

M112.945 — 3.2L V6 Petrol (1998-2005)

Power Output
215 hp
Years Fitted
1998-2005

Can’t find your exact engine code?-> Get quotes for M112 Mercedes Benz G Class G 320 engine replacement

-> Get quotes for M112 Mercedes Benz G Class G 320 engine replacement

Common Problems

Mercedes Benz G Class G 350 / G 500 (Older Petrol) Engine Problems Repair Cost vs Replacement

The Mercedes Benz G Class G 320 and G 500 rely on the M112 V6 and M113 V8 engine families - both considered among Mercedes' most reliable petrol engines. However, age and mileage bring well-documented issues: oil leaks from valve cover gaskets, timing chain tensioner wear on higher-mileage examples, and harmonic balancer failures. Every rebuilt engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty. Below we break down the most common G Class petrol engine failures, what they cost to fix, and when replacement is the smarter financial decision.

Common failure points and repair options

M112 / M113 Oil Leaks

Affected
Mercedes Benz G Class G 320 (M112.945, 1998-2005) and G 500 (M113.962, 1998-2008)
Typical failure mileage
80,000 - 150,000 miles
Root cause
The valve cover gaskets and breather cover seals harden and crack due to repeated hot/cold engine cycles, allowing oil to weep onto the exhaust manifolds. This is a common problem on both M112 and M113 engines as they age.

Repair options

Repair tierDealer priceSpecialist price
Minor - Valve Cover Gasket Replacement (Both Sides)£600-£900£300-£500
Intermediate - Full Top-End Reseal£1,200-£1,800£700-£1,100
Full Replacement - Rebuilt Engine£6,000-£9,000£3,800-£6,800
Our recommendation
Oil leaks on M112 and M113 engines are rarely urgent but should not be ignored. The specialist valve cover gasket replacement at £300-£500 is excellent value and should last 80k+ miles. If you're already addressing one leak, consider doing the full top-end reseal - the labour overlaps significantly and the additional parts cost is modest.
-> Compare rebuilt M112 or M113 Mercedes Benz G Class petrol engine prices

M113 Timing Chain Tensioner Wear

Affected
Mercedes Benz G Class G 500 (M113.962, 1998-2008)
Typical failure mileage
100,000 - 180,000 miles
Root cause
The hydraulic timing chain tensioner can lose oil pressure retention when parked, causing chain slack and a characteristic rattle on cold start. If left unaddressed, the chain can skip teeth with catastrophic valve-piston contact.

Repair options

Repair tierDealer priceSpecialist price
Minor - Tensioner Only£500-£800£250-£400
Major - Full Timing Chain Set£2,500-£3,500£1,400-£2,200
Full Replacement - Rebuilt Engine£6,000-£9,000£4,200-£6,800
Our recommendation
At the first sign of cold-start rattle, do the tensioner-only specialist fix (£250-£400). If the rattle lasts more than 2 seconds or you've ignored it for 10k+ miles, go straight to the full chain set. The M113's SOHC design means chain failure is catastrophic - preventative attention is far cheaper than engine replacement.
-> Compare rebuilt M113 Mercedes Benz G Class G 500 engine prices

M112 / M113 Harmonic Balancer Failure

Affected
Mercedes Benz G Class G 320 (M112.945) and G 500 (M113.962, 1998-2008)
Typical failure mileage
100,000 - 200,000 miles
Root cause
The crankshaft pulley/harmonic balancer can fail, separating the outer ring from the inner hub. This can cause loss of power steering assist, belt drive failure, and in some cases, damage to surrounding components.

Repair options

Repair tierDealer priceSpecialist price
Minor - Harmonic Balancer Replacement£600-£900£350-£550
Full Replacement - Rebuilt Engine£6,000-£9,000£3,800-£6,800
Our recommendation
The harmonic balancer is a known weak point on M112 and M113 engines. If you notice any wobble, rumble, or belt noise from the front of the engine, replace the balancer immediately. It's a straightforward job for a specialist and far cheaper than the collateral damage of a complete failure.
-> Compare rebuilt M112 or M113 Mercedes Benz G Class petrol engine prices

Don't Let Engine Failure Write Off Your Mercedes Benz G Class G 350 or G 500

A failed engine doesn't have to mean the end of your classic G-Class petrol. Whether you're dealing with an M112 oil leak, M113 timing chain tensioner wear, or harmonic balancer failure, EnginesMarket makes it simple to compare prices from trusted UK Mercedes Benz G Class specialists. Every rebuilt engine in our network includes upgraded components designed to address the original failure point, a minimum 12-month unlimited mileage warranty, and nationwide delivery with supply & fit options available.

Compare Mercedes Benz G Class G 350 / G 500 Petrol Engine Replacement Prices Now ->

FAQ

Mercedes Benz G Class G 350 / G 500 (Older Petrol) Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz G Class G 350 / G 500 (Older Petrol) owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes Benz G Class G 350 / G 500 Petrol Engine Prices Today

Comparing quotes for your Mercedes Benz G Class G 320 or G 500 engine replacement is completely free and carries no obligation - enter your registration above, receive tailored prices from UK specialists who know the M112 and M113 V6 and V8 engines inside out, and get back on the road with confidence. Every rebuilt engine is backed by a minimum 12-month unlimited mileage warranty.

100+100+ G Class petrol engines supplied through our network
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