Excellent fuel quality or fuel detergents are required to reduce intake valve deposits in gasoline engines. However, engine oils also have a considerable effect on the deposits.In engine tests the cleanest valves were found with synthetic multigrade or mineral single grade oils, both containing no VI improvers. Popular SAE 10W-40 and 5W-50 oils formed more deposits because they contain VI improvers. Deposit weight correlated directly with oil shear stability which is a measure of the VI improver quality. Both engine oil and gasoline have to be chosen correctly for a clean intake system.
Effect of Engine Oil on Intake Valve Deposits
Sae Technical Papers
1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1989
1989-09-01
Conference paper
English
Effect of engine oil on intake valve deposits
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