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Mercedes SLK55 AMG SPECIALISTS

Mercedes Benz SLK Class 55 AMG Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes Benz SLK Class 55 AMG engine specialists. Compare prices on reconditioned, rebuilt and used engines for the hand-built 5.4-litre and 5.5-litre naturally aspirated V8s - supply & fit available nationwide.

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Mercedes Benz SLK Class 55 AMG Engine
from£4,500 to £8,500
  • Usedfrom £2,000
  • Reconditionedfrom £4,500
  • Common codesM113.981, M152.980, M113.989
Mercedes Benz slk Class 55 AMG Used Engine — M113.981Mercedes Benz slkUsed Engine — M113.981Mercedes Benz slk Class 55 AMG Reconditioned Engine — M113.981Mercedes Benz slkReconditioned Engine — M113.981Mercedes Benz slk Class 55 AMG Rebuilt Engine — M113.981Mercedes Benz slkRebuilt Engine — M113.981

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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 SLK 55 AMG Engine History & Specs at a Glance

The SLK 55 AMG represents the pinnacle of Mercedes' compact roadster line - the only V8-powered SLK ever produced. The R171 SLK 55 AMG launched in 2004 with the M113 5.4-litre naturally aspirated V8, producing 360hp and 510Nm of torque [8†L6-L7]. This hand-built engine from Affalterbach defined the AMG brand before the turbocharging era [8†L6-L7]. In 2012, the R172 SLK 55 AMG introduced the M152 5.5-litre naturally aspirated V8, delivering 422hp and 540Nm [3†L8][3†L15-L18]. Both engines represent the last of the naturally aspirated AMG V8s in the SLK lineage.

Mercedes Benz SLK 55 AMG
  1. 2004

    M113.981, 5.4L naturally aspirated V8, 360hp @ 5,750rpm, 510Nm torque (SLK 55 AMG, R171 launch)

  2. 2006

    2008 - M113.981 continues with minor refinements

  3. 2012

    M152.980, 5.5L naturally aspirated V8, 422hp @ 6,800rpm, 540Nm torque (SLK 55 AMG, R172 launch)

  4. 2012

    2015 - M152.980 continues through end of R172 production

Every engine fitted to the Mercedes Benz SLK Class 55 AMG is covered below, with UK rebuilt pricing and known failure points - from M113 oil leaks and crank sensor failure to M152 camshaft follower wear and rocker arm issues.

Engine Codes & Pricing

Mercedes Benz SLK 55 AMG Engine Codes Specifications & Replacement Cost

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

M113.981 — 5.4L Naturally Aspirated V8 (2004-2008) engine

M113.981 — 5.4L Naturally Aspirated V8 (2004-2008)

Power Output
360 hp (265 kW) @ 5,750 rpm
Torque
510 Nm (375 lb-ft) @ 4,000 rpm
Years Fitted
2004-2008
Displacement
5,439 cc
Cylinders
V8, 90° V-angle, SOHC, 24-valve (3 valves per cylinder)
Engine Code
M 113 E 54 / 113.981

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Common Problems

Mercedes Benz SLK 55 AMG Engine Problems Repair Cost vs Replacement

The SLK 55 AMG's M113 and M152 V8s are among AMG's most celebrated naturally aspirated engines - hand-built masterpieces from Affalterbach. The M113 is widely regarded as one of the most reliable AMG engines ever produced, with a legendary reputation for durability [1†L6-L7]. The M152 is a two-generation leap forward, offering a better soundtrack and higher redline [7†L45-L46]. However, both have well-documented weaknesses that can lead to significant repair costs. 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

M113 Oil Leaks & Crank Sensor Failure

Affected
Mercedes SLK 55 AMG (M113.981, 2004-2008)
Typical failure mileage
60,000-120,000 miles
Root cause
The M113 V8 is known for oil leaks from valve cover gaskets and the rear main seal [9†L36-L37]. The crankshaft position sensor is a well-documented failure point, typically around 90,000 miles, causing hot-start failure - the car will start from cold fine but won't start when hot [12†L32-L33]. Oil pump pickup tube O-ring failure can cause low oil pressure, exacerbated by high oil temperatures and track use [1†L11-L14][12†L27-L29].

Repair options

Repair tierDealer priceSpecialist price
Minor - Crank sensor replacement£300-£600£200-£400
Intermediate - Valve cover gasket replacement£600-£1,200£400-£800
Major - Rear main seal replacement£1,500-£2,500£1,000-£1,800
Full Replacement - Rebuilt M113 engine£8,000-£12,000£5,500-£8,500
Our recommendation
The M113's crank sensor is a known weak point - keeping a spare in the glove box is a common owner recommendation [12†L33-L35]. Oil leaks on the 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. If you experience hot-start failure, replace the crank sensor immediately - it's a cheap and straightforward fix that prevents being stranded.
-> Compare rebuilt M113 Mercedes SLK 55 AMG engine prices

M152 Camshaft Follower & Rocker Arm Wear

Affected
Mercedes SLK 55 AMG (M152.980, 2012-2015)
Typical failure mileage
60,000-100,000 miles
Root cause
The M152 can suffer from cam follower and rocker arm failure [7†L5-L6][2†L24-L27]. Symptoms include engine noise (tapping, ticking, or popping), rough running, lack of performance, and engine stalling [7†L5-L6][7†L11-L13]. Failure can be caused by stuck or sticking engine valves [7†L7-L8]. Carbon buildup on intake valves can also cause them to not seat properly, leading to air and fuel leakage during compression and combustion [7†L23-L25]. Replacing cam followers and rocker arms is recommended in sets to prevent future failures [2†L27-L29].

Repair options

Repair tierDealer priceSpecialist price
Diagnostics - Valve train inspection£200-£400£150-£300
Intermediate - Cam follower replacement£1,500-£2,500£1,000-£1,800
Major - Rocker arm & follower replacement£2,500-£4,000£1,600-£2,800
Full Replacement - Rebuilt M152 engine£10,000-£14,000£6,500-£10,000
Our recommendation
The M152 is considered a reliable engine with no systemic weak points [2†L5-L6][2†L43-L44]. However, if you experience tapping or ticking noises from the engine, have the valve train inspected immediately. Replacing cam followers and rocker arms in sets at a specialist is significantly cheaper than dealer rates. On an SLK 55 AMG worth £18,000-£30,000, preventative maintenance is always the better investment.
-> Compare rebuilt M152 Mercedes SLK 55 AMG engine prices

M113/M152 Exhaust Flap & Engine Mount Issues

Affected
Mercedes SLK 55 AMG (M113.981, M152.980, 2004-2015)
Typical failure mileage
50,000-100,000 miles
Root cause
The M152's twin-pipe exhaust system has adjustable flaps that affect exhaust noise - at engine speeds below 2,000 rpm, the flaps remain closed [2†L31-L34]. Exhaust flap issues are more common than engine problems on the M152 [2†L7]. Engine vibration at idle can be caused by low idle speed or hard engine mounts, affecting vehicles up to chassis number 171.473#F029282 [9†L5-L7]. Heavy engine use can cause engine mounts to wear out [9†L10].

Repair options

Repair tierDealer priceSpecialist price
Minor - Exhaust flap actuator inspection£200-£400£150-£300
Intermediate - Exhaust flap actuator replacement£500-£900£350-£700
Intermediate - Engine mount replacement£500-£1,000£350-£750
Full Replacement - Rebuilt M113/M152 engine£8,000-£14,000£5,500-£10,000
Our recommendation
Exhaust flap issues and engine mount wear are common on higher-mileage SLK 55 AMG models but are usually straightforward to fix. Engine mount replacement at a specialist is significantly cheaper than dealer rates. If you experience engine vibration at idle, have the mounts and idle speed checked before assuming more serious engine issues.
-> Compare rebuilt M113/M152 Mercedes SLK 55 AMG engine prices

Don't Let Oil Leaks, Crank Sensor Failure, or Valve Train Wear Write Off Your Mercedes SLK 55 AMG

Whether you're facing M113 oil leaks and crank sensor failure on your R171 SLK 55 AMG or M152 camshaft follower wear on your R172 SLK 55 AMG, EnginesMarket makes it simple to compare quotes from trusted UK Mercedes AMG specialists. Every rebuilt engine in our network carries upgraded components addressing the original design weakness - new gaskets and seals, fresh crank sensors, and reinforced valve train components - 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 AMG specialists who know these hand-built V8 engines inside out.

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FAQ

Mercedes Benz SLK 55 AMG Engine ReplacementFrequently Asked Questions

Everything Mercedes Benz SLK Class 55 AMG owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

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Comparing quotes for your Mercedes SLK 55 AMG is completely free, with no obligation and no pressure. Enter your registration above to get tailored quotes from UK Mercedes AMG specialists who understand the M113 and M152 V8 engines inside out. Whether you need a used engine, a reconditioned unit, or a full rebuilt engine with upgraded gaskets, seals, and valve train components, we'll connect you with the right specialist for your exact SLK - with a minimum 12-month warranty on every engine supplied.

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