Mercedes Benz CLA 35 AMG Engine Replacement Compare Prices & Get Quotes

A Mercedes CLA 35 AMG replacement engine typically costs between £2,200 for a used M260 unit and £6,000 for a fully rebuilt engine. Specialist fitting adds £600-£1,000 due to the complexity of the 4MATIC system.

• Used M260 DE20 LA engines: £2,200-£3,500 depending on mileage and condition
• Reconditioned M260 units: £3,500-£5,000 supply only
• Rebuilt M260 units: £4,500-£6,000 supply only
• Specialist fitting adds £600-£1,000; dealer labour is significantly higher
• 12-month warranty included on all rebuilt units through EnginesMarket

The M260 DE20 LA engine in the CLA 35 AMG has developed a reputation for premature cylinder head wear - particularly exhaust valve seat and guide failure - often at mileages as low as 25,000-50,000 miles. Oil consumption and timing chain tensioner issues have also been reported.

• Cylinder head wear is the most significant issue affecting the M260 engine family
• Symptoms include misfires, loss of compression, starting problems and engine management lights
• Oil consumption due to piston ring wear can occur from 40,000 miles
• Timing chain rattling on cold start signals imminent tensioner failure
• Regular oil changes every 10,000 miles are critical for engine longevity

With proper maintenance, the M260 DE20 LA engine can reach 100,000-150,000 miles. However, cylinder head failures reported at 25,000-50,000 miles suggest some units may fail prematurely due to manufacturing defects.

• Cylinder head failure can occur as early as 19,000-50,000 miles
• Well-maintained units without cylinder head defects: 100,000-150,000 miles possible
• Regular oil changes every 10,000 miles (not Mercedes' 15,000-18,000 mile interval) significantly extends life

All CLA 35 AMG models use the same M260 DE20 LA engine. The key consideration is whether the cylinder head has been replaced with the improved version. Early 2019-2021 models appear to have the highest failure rates.

• 2019-2021 CLA 35 AMG: highest reported cylinder head failure rates
• 2022+ models: improved cylinder head design fitted from factory in some cases
• Always check service history for regular oil changes using Mercedes-approved oil
• Ask if the cylinder head has been replaced - if not, budget for potential replacement

Cylinder head replacement on a CLA 35 AMG M260 engine costs £3,500-£5,000 at a specialist or £5,000-£7,000 at a main dealer. If bottom-end damage has occurred, full engine replacement at £5,000-£7,500 is required.

• Specialist cylinder head replacement: £3,500-£5,000 including parts and labour
• Dealer pricing for same work: £5,000-£7,000
• The cylinder head job is approximately 19 hours of labour
• If cylinder head failure has caused bottom-end damage, full engine replacement is required

Yes. A CLA 35 AMG is worth £25,000-£35,000 - a rebuilt engine at £5,000-£7,500 represents roughly 15-20% of the car's value, making replacement economically justifiable for a car in otherwise good condition.

• CLA 35 AMG with good body/interior: replacement engine is cost-effective
• Specialist rebuilt engines fix original design weaknesses and include warranty
• Compare against £7,000-£9,500 main dealer new engine quotes

No. The CLA 35 AMG uses the M260 DE20 LA engine (306 hp, 400 Nm), while the CLA 45 AMG uses the M133 (first-generation) or M139 (second-generation) engine with significantly higher power output (360-421 hp). They are not interchangeable.

• CLA 35 AMG: M260 DE20 LA, 306 hp, 400 Nm
• CLA 45 AMG (2015-2019): M133, 360-381 hp - different engine family
• CLA 45 S AMG (2019+): M139, 421 hp - hand-built AMG engine
• Engine codes, mounting points and electronics are not compatible between the two