- After unscrewing the oil filler cap, check the gasket for porosity and damage
- Check the fastening of the ventilation hoses from the oil filler cap to the air filter for tightness.
- Cylinder head cover gasket; cylinder head gasket.
- The connection point of the ignition distributor flange.
- Oil filter gasket.
- Oil drain plug (gasket).
- Oil pan gasket.
- Connection between engine and gearbox (oil seal at the flywheel or gearbox shaft).
It is very difficult to immediately determine the location of the leak, so it is recommended to proceed as follows:
- Wash and clean the engine thoroughly.
- Sprinkle chalk or talc on the joints and gaskets on the engine.
- Check the oil level and top up if necessary.
- Inspect the engine after a test drive.
- Locate leaks and repair damage.