Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Oil Filter: All Technical Service Bulletins
Oil Filter - Changing as a Result of Fouled Plugs
86-20
0
DEC., 1985
Subject:
OIL FILTER CHANGE REQUIREMENTS AS A RESULT OF SPARK PLUG FOULING
Model and Year:
ALL MODELS
TO:
ALL CHEVROLET DEALERS
Last winter, a number of dealers were found to be changing a large number of engine oil filters. Our investigation revealed that an oil and filter change
was being performed in conjunction with a spark plug fouling repair. The concern of the dealer was that the oil had been contaminated by gasoline when
the engine failed to start.
Gasoline in the oil will boil off at relatively low temperatures and will have no detrimental effect on engine performance. Changing oil or oil filters as a
result of fouled spark plugs is not necessary.
