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Mercedes-Benz C300 Petrol SPECIALISTS

Mercedes-Benz C-Class 300 Petrol Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Mercedes-Benz C-Class 300 petrol engine specialists. Compare prices on reconditioned, rebuilt and used M272, M276, M274 and M254 engines - supply & fit available nationwide.

Supply & Fit Available
12-Month Warranty
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100+ Suppliers
Mercedes-Benz C-Class 300 Petrol Engine
from£1,800 to £5,500
  • Usedfrom £600
  • Reconditionedfrom £1,800
  • Common codesM272.947, M272.948, M276.957
Mercedes Benz c-class Mercedes-Benz C-Class 300 Petrol Used Engine — M272.947 / M272.948Mercedes Benz c-classUsed Engine — M272.947 / M272.948Mercedes Benz c-class Mercedes-Benz C-Class 300 Petrol Reconditioned Engine — M272.947 / M272.948Mercedes Benz c-classReconditioned Engine — M272.947 / M272.948Mercedes Benz c-class Mercedes-Benz C-Class 300 Petrol Rebuilt Engine — M272.947 / M272.948Mercedes Benz c-classRebuilt Engine — M272.947 / M272.948

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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 C-Class 300 Petrol Engine History & Specs at a Glance

The C300 petrol badge has represented the V6 and high-performance four-cylinder petrol options across three generations of the Mercedes-Benz C-Class. From the naturally aspirated 3.0-litre M272 V6 in the W204, through the 3.5-litre M276 V6 in the facelift W204, to the turbocharged 2.0-litre M274 four-cylinder in the W205, and finally the advanced M254 2.0-litre mild hybrid in the W206 - the C300 has consistently offered a compelling blend of power, refinement and efficiency.

Mercedes-Benz C-Class 300 Petrol
  1. 2007

    M272.947, 3.0L V6 petrol, 231 hp (170 kW) - W204 C300 launch; 300 Nm torque; naturally aspirated 90° V6

  2. 2008

    M272.948, 3.0L V6 petrol, 231 hp - W204 C300 4MATIC variant

  3. 2012

    M276.957, 3.5L V6 petrol, 252 hp (185 kW) - W204 C300 facelift; 340 Nm torque; direct injection replaces M272

  4. 2014

    M274.920, 2.0L turbo petrol, 241-245 hp (180 kW) - W205 C300 launch; 370 Nm torque; 0-62 mph in 5.9 seconds

  5. 2019

    M274.920 with EQ Boost, 258 hp - W205 C300 facelift; mild hybrid assistance

  6. 2021

    M254.920, 2.0L MHEV turbo petrol, 258 hp (190 kW) - W206 C300 launch; 400 Nm torque; 48V ISG system

Every engine fitted to the Mercedes-Benz C-Class 300 petrol is covered below, with UK rebuilt pricing and known failure points.

Engine Codes & Pricing

Mercedes-Benz C-Class 300 Petrol Engine Codes Specifications & Replacement Cost

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

M272.947 / M272.948 — 3.0L V6 Petrol (2007-2012) engine

M272.947 / M272.948 — 3.0L V6 Petrol (2007-2012)

Power Output
231 hp (170 kW) at 6,000 rpm
Torque
300 Nm at 2,500-5,000 rpm
Years Fitted
2007-2012

Can’t find your exact engine code?

-> Get quotes for M272.947 / M272.948 Mercedes-Benz C300 petrol engine replacement

Common Problems

Mercedes-Benz C-Class 300 Petrol Engine Problems Repair Cost vs Replacement

The C300 petrol has been powered by four distinct engine families across the W204, W205 and W206 generations - the M272 3.0L V6, the M276 3.5L V6, the M274 2.0L turbo, and the M254 2.0L mild hybrid. Each has distinct failure patterns. Rebuilt C300 petrol engines through EnginesMarket include upgraded components designed to address the original failure points, plus a minimum 12-month unlimited-mileage warranty.

Common failure points and repair options

M272 Balance Shaft Sprocket Wear

Affected
Mercedes-Benz C-Class 300 petrol (M272.947 and M272.948, W204, 2007-2012)
Typical failure mileage
60,000-100,000 miles
Root cause
Early M272 engines (2004-2008) suffer from balance shaft sprocket wear due to improperly hardened metal gears. The balance shaft gear wears prematurely, causing the timing to be thrown off and triggering fault codes P0016/P0017. Symptoms include a check engine light, rough idle, and potential engine damage if not addressed.

Repair options

Repair tierDealer priceSpecialist price
Balance Shaft & Timing Chain Replacement£3,500-£5,000£2,200-£3,500
Post-Failure Engine Rebuild£5,000-£7,500£3,500-£5,500
Full Replacement - rebuilt M272 engine£5,500-£8,000£3,200-£5,500
Our recommendation
If your W204 C300 V6 throws codes P0016/P0017 and you have an early M272 engine, the balance shaft sprocket is almost certainly the cause. A balance shaft and timing chain replacement at a specialist (£2,200-£3,500) is the most cost-effective solution. On a C Class worth £3,000-£8,000, if the engine has already suffered damage, a fully rebuilt M272 with upgraded components may be the better long-term investment.
-> Compare rebuilt M272 Mercedes-Benz C300 petrol engine prices

M276 Camshaft Adjuster Rattle

Affected
Mercedes-Benz C-Class 300 petrol (M276.957, W204 facelift, 2012-2014)
Typical failure mileage
60,000-120,000 miles
Root cause
The M276 V6 can suffer from camshaft adjuster rattle and timing chain tensioner wear. Symptoms include a rattling noise from the front of the engine, particularly on cold start. Spark plug indexing issues can also cause misfires and idle quality problems.

Repair options

Repair tierDealer priceSpecialist price
Timing Chain Tensioner Replacement£800-£1,500£500-£900
Camshaft Adjuster Replacement£1,500-£2,500£1,000-£1,800
Full Replacement - rebuilt M276 engine£5,000-£7,500£2,500-£4,500
Our recommendation
If you hear a rattling noise from the front of the engine on cold start, have the timing chain tensioner and camshaft adjusters inspected immediately. A £500-£900 tensioner replacement is significantly cheaper than a full engine replacement.
-> Compare rebuilt M276 Mercedes-Benz C300 petrol engine prices

M274 Wrist Pin / Piston Crack

Affected
Mercedes-Benz C-Class 300 petrol (M274.920, W205, 2014-2021)
Typical failure mileage
40,000-80,000 miles
Root cause
The M274 engine suffers from a wrist pin / piston seizure failure. Mercedes technical service bulletin LI03.10-P-060916 addresses the wrist pin concern. The knocking noise might be attributed to the unfavourable tolerance of the piston wrist pin resulting in enlarged end float of the connecting rod in the piston. A petition was submitted to NHTSA requesting an investigation into alleged "wrong-sized wrist pins" in M274-equipped vehicles.

Repair options

Repair tierDealer priceSpecialist price
No Preventative Fix AvailableN/AN/A
Single Piston Replacement£3,000-£4,500£1,800-£2,800
Full Replacement - rebuilt M274 engine£5,000-£7,500£2,500-£4,800
Our recommendation
The M274 piston crack is a frustrating failure because there is no preventative fix. The first warning is often unusual engine noise or a misfire code. On a 2014-2021 W205 C-Class worth £6,000-£15,000, a specialist replacement with an upgraded rebuilt unit (£2,500-£4,800 fitted) is almost always better value than attempting to rebuild the original engine. Ensure any replacement engine specifically states it has upgraded wrist pin/piston components.
-> Compare rebuilt M274 Mercedes-Benz C300 petrol engine prices

M254 Camshaft Centre Valve Filter Defect

Affected
Mercedes-Benz C-Class 300 petrol (M254.920, W206, 2021-present)
Typical failure mileage
20,000-50,000 miles
Root cause
Reports indicate camshaft centre valve screw filter defects on certain production batches (pre-July 2024), where the filter mesh can detach and block oil galleries, potentially causing camshaft damage and engine failure. The 48V integrated starter-generator (ISG) can also experience software-related faults.

Repair options

Repair tierDealer priceSpecialist price
Camshaft Centre Valve Inspection & Replacement£800-£1,500£500-£1,000
48V System Diagnostics & Software Update£300-£600£200-£400
Full Replacement - rebuilt M254 engine£6,000-£8,500£3,200-£5,500
Our recommendation
If your W204 C300 V6 throws codes P0016/P0017 and you have an early M272 engine, the balance shaft sprocket is almost certainly the cause. A balance shaft and timing chain replacement at a specialist (£2,200-£3,500) is the most cost-effective solution. On a C Class worth £3,000-£8,000, if the engine has already suffered damage, a fully rebuilt M272 with upgraded components may be the better long-term investment.
-> Get quotes for M254 camshaft centre valve inspection and engine replacement for your C300 petrol

Don't Let Engine Failure Write Off Your Mercedes-Benz C-Class 300 Petrol

Engine failure doesn't always mean the end of the road for your C300 petrol. Whether your M272 needs a balance shaft replacement, your M274 has a wrist pin failure, your M254 has a camshaft centre valve defect, or a full rebuild is required, EnginesMarket makes it simple to compare prices from trusted UK Mercedes-Benz C-Class 300 petrol specialists. Every rebuilt engine supplied through our network includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited-mileage warranty with nationwide delivery. Compare prices today and get back on the road without the main dealer premium.

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FAQ

Mercedes-Benz C-Class 300 Petrol Engine ReplacementFrequently Asked Questions

Everything Mercedes-Benz C-Class 300 Petrol owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

Why Choose Us

Compare Mercedes-Benz C-Class 300 Petrol Engine Prices Today

Comparing quotes for your C300 petrol is free, no-obligation, and specific to your exact M272.947, M272.948, M276.957, M274.920 or M254.920 engine code and generation. Our vetted UK specialists provide transparent pricing on used, reconditioned and rebuilt engines - with a minimum 12-month unlimited-mileage warranty on every rebuilt unit. Enter your registration above, compare prices, and choose the right engine for your C-Class today.

500+500+ C300 petrol M272, M276, M274 and M254 engines supplied through our network
12-Month12-Month Warranty on every rebuilt C300 petrol engine
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