Engine bay check when oil is leaking

Engine and diagnostics

Oil leak under the car: when not to wait

Oil under a car can be a small seep, but it can also risk engine damage or safety. The amount, location, colour and whether the leak is getting worse all matter.

Practical advice

Quick answer

If you find a fresh oil stain under the car, first check roughly where it is and whether it is growing. A small old seep can often be booked for inspection, but a fast leak, oil warning light, burning smell or smoke is a reason not to keep driving and to call.

Oil or another fluid?

Not every stain under a car is engine oil. It may be gearbox oil, coolant, brake fluid, power steering fluid or air-conditioning condensation. Engine oil is usually greasy and darker, but the workshop check confirms it. Brake fluid or any large fluid leak should be handled quickly.

Why not delay it

Low oil level can damage the engine. Oil on hot parts can smell or smoke. Oil on chassis or brake-related parts can affect safety. It is better to identify the source before a small leak becomes a larger repair.

What to send before visiting

A photo of the stain, a photo of the area under the car, how fast the stain appears, whether the oil warning light is on and whether the car smells or smokes all help. If you are not sure, call and describe what you see.

Do not keep driving when

  • the oil warning light is on or flashing
  • oil leaks quickly and the stain grows
  • the car smokes or smells burnt
  • the leak is near brakes or tyres
  • you are not sure whether it is brake fluid