All Models
- Check for blow cylinder head gasket.
- Check for leaking camshaft oil seals.
- Check for sticky piston ring.
- Check for worn pistons or cylinders.
- Check for piston ring groove or piston ring.
- Check for incorrect location of piston ring gap.
- Check for worn or damaged valve stem seal.
- Check for worn valve stem.
- Check for malfunctioning PCV valve.