External leak
Cover gaskets, sump, cap or head gasket can let oil seep. Marks under the vehicle point this way.
COMMON FAILURES01 02 03
The oil level keeps dropping
A falling level can come from a visible leak or from internal consumption. Smoke colour and marks on the ground help tell them apart.
Possible causes
Internal consumption
Worn rings or valve stem seals let oil into combustion, often with blue smoke at the exhaust.
Turbocharger
A turbo whose seals let oil through can consume it without any leak visible on the ground.
Price benchmarks
| Repair | Observed range |
|---|---|
| Turbocharger | 1500 – 3500 € incl. VAT |
| Head gasket | 800 – 2500 € incl. VAT |
Prices observed in France, parts and labour included. Method and sources
Questions to ask the garage
- Was the level checked cold and on level ground?
- Was a leak search carried out, and where?
- Is a compression or oil consumption test planned?
Indicative preliminary diagnosis. Does not replace a vehicle inspection by a professional.
Describe your case
Describe your vehicle and what you observed: the analysis is based on your case.
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