oil in tailpipe on 1990 Ford F-150

1987 f150 has oil in tailpipe and smoke screen at times oil pressure is good and runs smooth. replaced pcv valve but did not fix. where else could oil be coming from? almost seems like it is getting sucked out of oil pan

by in Fairfax Station, VA on December 28, 2010
1 answer
ANSWER by on December 28, 2010
Oil may leak down the valve guides particularly after the engine has been shut off and started from cold,if so blue oil smoke may be emitted from the tail pipe on start up, (this may also be noticeable if the car is left idle for a few minutes and then accelerated away for example after sitting at a traffic light). If the piston oil control rings are worn the engine normally smokes on acceleration. Oil control rings may fail due to an engine that has badly overheated or has had infrequent engine oil changes. Frequent oil changes with good quality oil is critical to long engine life. Perhaps changing oil viscocity to the next "thicker" grade would help. Their is a test called a cylinder leakage test where compressed air is put in an engines cylinder with its valves closed to determine if an engine has cylinder head gasket, intake or exhaust valve, or worn piston rings/cylinder bore. It is a very valid test to determine the over all health of an engine.
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