Evaluation of Camshaft and Lifter Wear, Deposits, and Oil Thickening with Low-Phosphorus Engine Oils in Taxicab Service 861516
A 160 000-km taxi test was run to determine the effects of low-phosphorus engine oils on engine durability. Camshaft and lifter wear, deposits, and oil-thickening were evaluated in thirty vehicles with oil-change intervals purposely extended to increase test severity. Three SAE 5W-30, SF, low-phosphorus (≈0.06 mass percent) oils and two SAE 10W-30, SF/CC, normal-phosphorus (≈0.11 mass percent) oils were evaluated.
Overall engine durability and performance was satisfactory with two of the three low-phosphorus, and one of the normal-phosphorus oils, and unsatisfactory (because of high wear) with the other oils.
These results demonstrate that low-phosphorus oils can be provided if further phosphorus reduction is necessary to protect emission control systems, and that current normal-phosphorus oils must be properly formulated to protect engines.
Citation: Smolenski, D. and Kabel, R., "Evaluation of Camshaft and Lifter Wear, Deposits, and Oil Thickening with Low-Phosphorus Engine Oils in Taxicab Service," SAE Technical Paper 861516, 1986, https://doi.org/10.4271/861516. Download Citation
Donald J. Smolenski, Richard H. Kabel
General Motors Research Labs
1986 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Worldwide Lubricant Trends-SP-0676, SAE 1986 Transactions - Fuels and Lubricants-V95-7