Possible causes
Gaskets and oil seals
Over time gaskets lose their elasticity. Oil can get past the valve cover gasket, the sump gasket or the shaft seals. Light seepage is different from a dripping leak, and the decision depends on how bad it is.
Filter and drain plug after a service
If the spot appeared right after an oil change, the tightness of the filter and drain plug and the condition of the sealing washer are checked.
Oil on hot parts
A smell of burnt oil in the cabin or under the bonnet appears when oil reaches the exhaust manifold. This increases the risk of fire, so the check should not be put off.
What to tell the mechanic
- Where the spot appears: under the front of the engine, under the gearbox or near a wheel.
- How often and how much oil you top up.
- Whether you smell burnt oil or see smoke from under the bonnet.
What you can do
Check the oil level on the dipstick regularly until the leak is fixed. If oil is dripping heavily, smoke comes from under the bonnet or the oil pressure light comes on, do not drive on.
Where the check starts
The mechanic finds the exact cause during the inspection.
Frequently asked questions
The spot is small. Can I ignore it?
A small leak usually grows over time, and oil contaminates parts and rubber components. It is better to find the source while the repair is still simple.
Could it be something other than oil?
Yes. Coolant, transmission oil or condensation from the air conditioning can also leave marks under the car. The colour and smell help to tell them apart.