Oil leak
How it can appear on an MOT certificate
- “Oil leak, but not excessive”
- “Engine oil leak”
- “Excessive oil leak”
What it is
Oil leaking from the engine or gearbox, often from a gasket or seal. A light leak is common on older cars.
Why it matters
A leak that drips onto the road is an environmental issue and can be a fail. A bad leak can also let the oil level run low and damage the engine.
What to check when viewing a car
Look under the car where it's been parked and around the engine for oily residue. Check the oil level on the dipstick.
Has the car you're looking at had this before?
Free: every MOT, every defect explained in plain English, mileage, tax and ULEZ.
What the MOT categories mean
- Dangerous
- A direct and immediate risk to road safety, or a serious impact on the environment. The car fails and shouldn't be driven until it's repaired.
- Major
- It may affect the car's safety, put other road users at risk or harm the environment. The car fails and should be repaired straight away.
- Minor
- No significant effect on safety or the environment. The car passes, but it should be repaired as soon as possible.
- Advisory
- Something to keep an eye on that could need repairing in future. The car passes.
Related: seat belts, warning lights and other checks
- Seat belt damaged or not working
- Airbag (SRS) warning light on
- Horn not working
- Drive shaft CV boot split or damaged
- Fuel leak
- Battery insecure or leaking
Buying a used car?
General information about this type of MOT defect, not advice about a particular car. How serious it is depends on the car; have any car you're buying inspected by a qualified mechanic.