BMW 7 Series 750e Engine ReplacementCompare Prices & Get Quotes

A BMW 7 Series 750e engine replacement typically costs £2,000-£3,800 for a used B58B30S unit, £3,800-£6,000 for a reconditioned engine, and £5,000-£8,000 for a fully rebuilt engine with warranty. Supply & fit adds £650-£910 in specialist labour (10-14 hours). Note that the 750e's hybrid system adds complexity, and the high-voltage battery is a separate cost centre.

• Used engines: lowest upfront cost, limited warranty
• Reconditioned: mid-range, some new parts fitted
• Rebuilt: highest cost, fully restored to factory spec with 12-month warranty

Common symptoms include rough idle, engine misfires, oil in the intake or charge pipe, blue or white smoke from the exhaust on cold start, and a whistling or squealing noise from the engine. The PCV valve is a known weakness on the B58 engine, particularly on cars with upgraded turbos.

• Rough idle / misfires: first warning signs
• Oil in the intake: indicates PCV diaphragm failure
• Smoke on start-up: a classic symptom of PCV issues

With values ranging from £50,000 to £109,000, a full rebuilt engine at £5,000-£8,000 represents just 5-15% of the vehicle's value - making replacement financially viable for most examples. However, the hybrid battery may also need attention, with replacement costs of £7,000-£10,000+.

• £50,000-£70,000 car: evaluate both engine and battery health
• £70,000-£90,000 car: engine replacement is viable
• £90,000+ car: engine replacement makes strong financial sense

A typical BMW 7 Series 750e engine replacement takes 3-5 days for supply and fit at a specialist garage. The B58 straight-six has good engine bay access, but the hybrid system's high-voltage components require additional safety precautions and specialist knowledge. Most specialists offer collection/delivery options nationwide.

• Same-day dispatch available for in-stock engines
• Fitting typically completed within 3-5 working days
• Collection/delivery options available across the UK

The 740i uses the B58 straight-six producing 375hp with no hybrid assistance. The 750e uses the same B58 engine (308hp) paired with a 194hp electric motor for a combined 489hp and 700Nm of torque. The 750e offers 36 miles of electric-only range, lower CO2 emissions (25g/km), and significantly better fuel economy in city driving.

• 740i: 3.0L B58, 375hp, no hybrid
• 750e: 3.0L B58 + electric motor, 489hp, 36-mile EV range
• 750e replacement cost: higher due to hybrid system complexity

The B58 engine is considered one of BMW's most reliable modern engines, with a strong reputation for durability. The PCV valve is the main weakness. The hybrid system adds complexity, but BMW's PHEV technology is mature. However, the 22.1kWh battery will degrade over time, and replacement costs can be significant (£7,000-£10,000+).

• B58 engine: generally very reliable
• PCV valve: known weakness, replace at 60,000-100,000 miles
• Hybrid battery: expect degradation after 80,000-120,000 miles