Effect of Engine Oil on Intake Valve Deposits 892111
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.
Citation: Mikkonen, S., Niemi, A., Niemi, M., and Niskala, J., "Effect of Engine Oil on Intake Valve Deposits," SAE Technical Paper 892111, 1989, https://doi.org/10.4271/892111. Download Citation
Author(s):
Seppo Mikkonen, Aapo Niemi, Markku Niemi, Jorma Niskala
Affiliated:
Neste Oy Finland
Pages: 14
Event:
1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Passenger Car Motor Oils-SP-0799, SAE Transactions Journal of Fuels and Lubricants-V98-4
Related Topics:
Valves
Gasoline
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