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

A replacement engine for a BMW 325i costs £400-£5,000 depending on condition and generation. Used engines start from £400, reconditioned units range from £1,200-£2,200, and fully rebuilt engines with warranty cost £1,800-£5,000. Fitting adds £500-£1,000 depending on the specialist and your location.

• Used engines are the cheapest but come with limited warranty
• Reconditioned engines are stripped and have worn parts replaced
• Rebuilt engines are fully machined and assembled to factory specification with a 12-month warranty

Common symptoms include poor low-end torque, a hesitation or flat spot when accelerating from low revs, rough idle, and increased fuel consumption. You may also hear a rattling noise from the front of the engine on cold start on some models.

• VANOS solenoid seal failure is the most common cause
• Repair costs £300-£600 at a specialist
• Ignoring it can lead to reduced performance and increased wear on timing components

That depends on the condition of the car and the generation. A typical E46 325i is worth £1,800-£12,000, while E30 325i classics can command £12,000-£25,000+. If your car is in excellent condition, a rebuilt engine at £1,800-£5,000 can be a worthwhile investment. For a sub-£3,000 car, a used engine or targeted repair is usually more cost-effective.

• Check the car's overall condition before committing
• A rebuilt engine adds longevity and reliability
• Always compare quotes before making a decision

A typical engine replacement takes 2-3 days for a specialist, including removal of the old unit, fitting the replacement, and testing. Some suppliers offer next-day delivery on used engines, but fitting always requires workshop time.

• Supply-only: 1-2 days for delivery
• Supply & fit: 2-3 days at the workshop
• Cooling system overhaul: 1 day

The M54B25 (2000-2006) is a 2.5L naturally aspirated six-cylinder with 192 hp, featuring double-VANOS and a cast-iron block. The N52B25 (2005-2007) is also a 2.5L six-cylinder but produces 218 hp thanks to Valvetronic and a lighter magnesium-aluminium composite block, making it more powerful but also more complex and prone to specific issues like magnesium block corrosion.

• M54: simpler, robust, well-understood repairs
• N52: more powerful, lighter, but more complex
• E90 325i (2005-2007) uses N52; E90 LCI (2007-2011) uses N53B30

Yes - every rebuilt engine supplied through EnginesMarket carries a minimum 12-month unlimited-mileage warranty. This covers manufacturing defects and component failure, giving you peace of mind. Always confirm exact warranty terms with your chosen supplier before purchase.

• 12-month warranty is standard across our network
• Unlimited mileage on most policies
• Supply & fit options include warranty on labour as well