BMW 3 Series 325d Engine Replacement Compare Prices & Get Quotes

A BMW 3 Series 325d engine replacement typically costs between £4,500 and £7,500 for a reconditioned six-cylinder unit, depending on the engine code (M57 or N57) and the supplier.

• Used BMW 3 Series 325d engines: £1,800-£4,000
• Reconditioned BMW 3 Series 325d engines: £3,500-£6,500
• Rebuilt BMW 3 Series 325d engines: £4,500-£7,500

The N57-powered BMW 3 Series 325d (2010-2015) can suffer from timing chain stretch, with the chain mounted at the rear of the engine. Early warning signs include a metallic rattle on cold start. The earlier M57 engine (2006-2010) is less prone to timing chain issues but has its own weaknesses - notably swirl flap failure.

It depends on the age and condition of your car. For an E90 325d worth under £5,000, a timing chain repair or used engine often makes more sense than a full rebuilt unit. For an F30 325d worth £8,000+, a reconditioned or rebuilt engine with warranty is a sound investment given the car's retained value.

A BMW 3 Series 325d engine replacement typically takes 12-16 labour hours for the six-cylinder M57 or N57 unit. With a specialist, this usually means 2-4 working days from drop-off to collection.

• Supply only: engine can be delivered next working day
• Supply & fit: allow 3-4 days for the complete job

Both the BMW 325d and 330d use the same 3.0-litre six-cylinder diesel engine family (M57 or N57) - but the 325d is detuned.

• 325d: 197-204 hp depending on generation
• 330d: 231-258 hp depending on generation
• The 325d offers nearly all of the 330d's smoothness and torque at a lower purchase price and running cost

The M57 engine in the BMW 3 Series 325d (2006-2010) is generally robust, but common issues include:

• Swirl flap failure - flaps can detach and enter cylinders
• Injector failure
• EGR valve clogging
• DPF issues on urban-driven cars