Valve cover gasket needs replacing
No
oily deposit on the spark plugs electrodes
No spark from coil, bad plug wires, or bad plugs.
As the engine runs and its cylender size gets wider the oil from ur engine gets in contact with ur spark plugs As the engine runs and its cylender size gets wider the oil from ur engine gets in contact with ur spark plugs
check spark plugs and wires
start with the spark plugs
Time to replace seals, this usually causes misfire.
On the business end of the plug. Wet, oily deposits. Will cause weak spark and eventually misfire.Fault: worn bores/piston rings or valve guides; sometimes occurs (temporarily) during running-in period. Plugs can be re-used after a thorough cleaning. For Pictures. On the outside of the Plug. Oil would be from a Leaking Gasket or Seal.
Check the spark plug wires and spark plugs.
bad spark plug wires, low battery, broken rotor in the distributor
pcm or crank sencer
Spark plugs