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Mercedes S 280/420 Petrol SPECIALISTS

Mercedes Benz S Class 280/420 Petrol Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz S Class 280 and 420 petrol engine specialists. Compare prices on reconditioned, rebuilt and used engines for the 2.8-litre V6 and the 4.3-litre V8 - supply & fit available nationwide.

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Mercedes Benz S Class 280/420 Petrol Engine
from£2,200 to £4,800
  • Usedfrom £1,200
  • Reconditionedfrom £2,200
  • Common codesM112.922, M113.941
Mercedes Benz s-class 280/420 Petrol Used Engine — M112.922Mercedes Benz s-classUsed Engine — M112.922Mercedes Benz s-class 280/420 Petrol Reconditioned Engine — M112.922Mercedes Benz s-classReconditioned Engine — M112.922Mercedes Benz s-class 280/420 Petrol Rebuilt Engine — M112.922Mercedes Benz s-classRebuilt Engine — M112.922

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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 S Class 280/420 Petrol Engine History & Specs at a Glance

The S 280 and S 420 launched with the W220 generation in 1998 as the entry-level V6 and mid-range V8 petrol flagships of Mercedes' luxury saloon range. The S 280 was powered by the M112 2.8-litre V6 producing 204hp, while the S 420 used the M113 4.3-litre V8 with 279hp. Both engines featured SOHC design with three valves per cylinder and timing chain drive, representing the pinnacle of Mercedes naturally aspirated engineering before the modern era of forced induction and direct injection. Production continued until 2005 when the W221 generation replaced the W220.

Mercedes Benz S Class 280/420 Petrol
  1. 1998

    M112.922, 2.8L V6 petrol, 204hp @ 5,700rpm (S 280, W220 launch)

  2. 1998

    M113.941, 4.3L V8 petrol, 279hp @ 5,750rpm (S 420, W220 launch)

  3. 2002

    Minor ECU revisions to both engines for improved emissions

  4. 2005

    End of W220 production; replaced by W221 generation

Every engine fitted to the Mercedes Benz S Class 280 and 420 petrol is covered below, with UK rebuilt pricing and known failure points - from M112 harmonic balancer failure to M113 oil leaks and ignition system issues.

Engine Codes & Pricing

Mercedes Benz S Class 280/420 Petrol Engine Codes Specifications & Replacement Cost

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

M112.922 — 2.8L V6 Petrol (1998-2005) engine

M112.922 — 2.8L V6 Petrol (1998-2005)

Power Output
204 hp (150 kW) @ 5,700 rpm
Torque
270 Nm @ 3,000-5,000 rpm
Years Fitted
1998-2005
Displacement
2,799 cc (2.8L)
Cylinders
V6, 90° V-angle, SOHC, 18-valve
Engine Code
M 112 E 28 / 112.922

Can’t find your exact engine code?

-> Get quotes for M112.922 Mercedes S 280 engine replacement

Common Problems

Mercedes Benz S Class 280/420 Petrol Engine Problems Repair Cost vs Replacement

The S 280's M112 V6 and the S 420's M113 V8 are among Mercedes' most robust naturally aspirated petrol engines - renowned for their durability and longevity. However, with age and mileage, both have well-documented weaknesses that can lead to significant repair costs. The M112 is prone to harmonic balancer failure and oil leaks, while the M113 suffers from oil leaks, ignition system issues, and sensor failures. Every rebuilt engine supplied through EnginesMarket includes upgraded components addressing these original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

M112 Harmonic Balancer Failure

Affected
Mercedes S 280 (M112.922, 1998-2005)
Typical failure mileage
80,000-150,000 miles
Root cause
The M112's harmonic balancer (crankshaft pulley) has a bonded rubber layer that deteriorates with age, heat cycling, and exposure to oil and contaminants. This can cause the outer ring to separate at speed, potentially leading to catastrophic engine damage. This is the signature failure of the M112 engine family.

Repair options

Repair tierDealer priceSpecialist price
Preventative - Harmonic balancer inspection£100-£200£80-£150
Intermediate - Harmonic balancer replacement£600-£1,000£400-£700
Full Replacement - Rebuilt M112 engine£4,500-£6,000£2,500-£3,800
Our recommendation
The M112's harmonic balancer is a known weakness with age. If you notice unusual noises from the passenger side of the engine bay or any wobble from the main crank pulley, do not drive the vehicle. Specialist harmonic balancer replacement at £400-£700 is significantly cheaper than dealer rates. On an S 280 worth £3,000-£10,000, preventative attention to this issue is always the better investment.
-> Compare rebuilt M112 Mercedes S 280 engine prices

M112/M113 Oil Leaks

Affected
Mercedes S 280 (M112.922), S 420 (M113.941), 1998-2005
Typical failure mileage
60,000-120,000 miles
Root cause
Valve cover gaskets harden with age, causing oil to leak onto the exhaust manifold or into spark plug wells. Oil consumption and leaks from valve guide seals are also common. Approximately 30% of M113 owners report oil leaks as the most common issue.

Repair options

Repair tierDealer priceSpecialist price
Minor - Valve cover gasket replacement£400-£800£250-£550
Intermediate - Full gasket set replacement£1,200-£2,000£800-£1,400
Full Replacement - Rebuilt M112/M113 engine£4,500-£6,500£2,500-£4,800
Our recommendation
Oil leaks on the M112 and M113 are common with age but not usually urgent unless they are heavy. Valve cover gasket replacement at a specialist is significantly cheaper than dealer rates. Use only OEM Mercedes-Benz gaskets - aftermarket seals are too thin and will leak.
-> Compare rebuilt M112/M113 Mercedes S 280/420 engine prices

M113 Ignition System & Sensor Failures

Affected
Mercedes S 420 (M113.941, 1998-2005)
Typical failure mileage
60,000-120,000 miles
Root cause
The M113 V8 can suffer from ignition system failures causing engine misfires, reported by approximately 20% of owners. The crankshaft position sensor is known to fail, which can cause the car not to start or to stall. Mass Airflow (MAF) sensor failures and throttle body issues are also common.

Repair options

Repair tierDealer priceSpecialist price
Minor - Sensor replacement (single)£300-£600£200-£450
Intermediate - Ignition system overhaul£800-£1,500£500-£1,000
Full Replacement - Rebuilt M113 engine£5,000-£7,000£3,200-£4,800
Our recommendation
If your S 420 experiences misfires or starting issues, have the ignition system and sensors inspected immediately. The crankshaft position sensor is a known weak point - if it fails, the car will not start. Specialist sensor replacement is significantly cheaper than dealer rates. On an S 420 worth £3,000-£10,000, preventative attention is always the better investment.
-> Compare rebuilt M113 Mercedes S 420 engine prices

M112 Variable Intake Flap Failure

Affected
Mercedes S 280 (M112.922, 1998-2005)
Typical failure mileage
80,000-150,000 miles
Root cause
The M112's variable intake manifold flaps can stick or seize, causing increased fuel consumption and loss of low-speed torque. Broken switchover linkages at the front of the intake manifold are also common.

Repair options

Repair tierDealer priceSpecialist price
Minor - Intake flap linkage repair£400-£800£250-£500
Intermediate - Intake manifold replacement£1,000-£1,800£700-£1,200
Full Replacement - Rebuilt M112 engine£4,500-£6,000£2,500-£3,800
Our recommendation
Variable intake flap issues on the M112 are a known weakness. If you notice loss of low-speed torque or increased fuel consumption, have the intake manifold inspected. Replacing the broken linkage at a specialist is significantly cheaper than a full manifold replacement.
-> Compare M112 Mercedes S 280 engine quotes

Don't Let Harmonic Balancer Failure, Oil Leaks, or Ignition Issues Write Off Your Mercedes S 280 or 420 Petrol

Whether you're facing M112 harmonic balancer failure on your S 280, oil leaks on your S 420, or ignition system issues, EnginesMarket makes it simple to compare quotes from trusted UK Mercedes petrol specialists. Every rebuilt engine in our network carries upgraded components addressing the original design weakness - new harmonic balancers, fresh gaskets and seals, and fully tested ignition systems - plus a minimum 12-month unlimited mileage warranty with nationwide delivery and supply & fit options. Don't pay main dealer premiums. Compare prices from independent Mercedes specialists who know these classic V6 and V8 engines inside out.

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FAQ

Mercedes Benz S Class 280/420 Petrol Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz S Class 280/420 Petrol owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes S Class 280/420 Petrol Engine Prices Today

Comparing quotes for your Mercedes S 280 or S 420 petrol is completely free, with no obligation and no pressure. Enter your registration above to get tailored quotes from UK Mercedes petrol specialists who understand the M112 V6 and M113 V8 engines inside out. Whether you need a used engine, a reconditioned unit, or a full rebuilt engine with upgraded harmonic balancers, new gaskets, and fresh ignition components, we'll connect you with the right specialist for your exact S Class - with a minimum 12-month warranty on every engine supplied.

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