Change Car Turbo BMW 7-Series
Change Car Turbo
| Estimated time | 6h00–29h00 |
|---|---|
| Estimated labour cost | ~600–2900£ |
| Difficulty | Very technical |
| Vehicles |
7-Series 2001-2008 4
7-Series 2008-2015 6
7-Series 2015-2025 9
|
| Renew the turbocharger | 8h00 |
| Renew the turbocharger Rear-wheel drive | 8h00 |
What is the role of the BMW 7-Series turbo?
The turbocharger increases engine power by compressing the intake air, allowing more air (and therefore more fuel) into the combustion chambers. It is driven by exhaust gases spinning a turbine at speeds up to 250,000 rpm. The compressed intake air passes through an intercooler to reduce its temperature before entering the engine.
What are the symptoms of a failing BMW 7-Series turbo?
Common symptoms include: loss of engine power or boost, excessive exhaust smoke (blue/white for oil burning, black for over-fuelling), whining or whistling noise from the turbo area, engine warning light or turbo fault codes, oil leaks at the turbo housing, increased oil consumption.
What causes BMW 7-Series turbo failure?
The main causes are: oil starvation (blocked or restricted oil feed lines, low oil level, poor oil quality), foreign object ingestion, excessive exhaust temperature, worn bearings due to high mileage, and contaminated oil. Always investigate and fix the root cause before fitting a replacement turbo.
Can a BMW 7-Series turbo be reconditioned?
Yes, turbo reconditioning is a common and cost-effective alternative to buying new. A reputable service will disassemble, inspect, replace worn parts, rebalance, and test the unit. Expect to pay 30–60% of the new price.
Is it difficult to change a BMW 7-Series turbo?
Difficulty level 5/5: very technical. The turbo is connected to both the intake and exhaust systems, requiring numerous disassembly steps. Approximately 5 hours on average for a professional mechanic. Key precautions after fitting: change the engine oil and filter, prime the turbo with oil before starting, allow the turbo to cool down after hard driving by idling for 30 seconds before switching off.
3 models covered
| Model | Year Range | Engines covered | Fuel |
|---|---|---|---|
| 7-Series 2001-2008 | 2001-2008 | 730d Diesel (M57D30TU), 730d, Ld Diesel (M57D30T2), 730i, Li Petrol (M54B30), 730i, Li, -LPG LPG,Petrol (N52B30A), 735i, Li, -LPG LPG,Petrol (N62B36A), 740d Diesel (M67D39), 740i, Li Petrol (N62B40A), 745d Diesel (M67D44), 745i, Li, -LPG LPG,Petrol (N62B44A), 750i, Li, -LPG LPG,… | Diesel, LPG, Petrol |
| 7-Series 2008-2015 | 2008-2015 | 725d Diesel (N57D30A), 730d Diesel (N57D30A), 730d, -xDrive Diesel (N57D30A), 730d, -xDrive Diesel (N57D30A), 740d, -xDrive Diesel (N57D30B), 740d, -xDrive Diesel (N57D30B), 740i Petrol (N54B30A), 740i Petrol (N55B30A), 750d, -xDrive Diesel (N57D30C), 750i, Li, -xDrive Petrol (N… | Diesel, Petrol |
| 7-Series 2015-2025 | 2015-2025 | 725d Diesel (B47D20B), 725d, Ld Diesel (B47D20B), 730d, Ld, -xDrive Diesel (B57D30A), 730i, Li Petrol (B48B20B), 740d xDrive Diesel (B57D30B), 740e, Le iPerformance Electricity,Petrol (B48B20B+GC1), 740i, Li Petrol (B58B30A), 740i, Li, -xDrive Petrol (B58B30C), 750d, Ld, -xDrive… | Diesel, Electricity, Petrol |
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