Cam and Lifter Wear as Affected by Engine Oil ZDP Concentration and Type

Paper #:
  • 770087

Published:
  • 1977-02-01
Citation:
Pless, L. and Rodgers, J., "Cam and Lifter Wear as Affected by Engine Oil ZDP Concentration and Type," SAE Technical Paper 770087, 1977, https://doi.org/10.4271/770087.
Pages:
14
Abstract:
The recent increase in excessive camshaft and lifter wear after extended service has shown that some SE-quality engine oils do not provide adequate protection.To determine the effects of oil additives on wear, controlled tests were run using 1972-1974 model cars, unleaded gasoline, and either SE commercial products or experimental formulations. Field experience with 1970-1975 model trucks, leaded gasoline, and SE/CC or SE/CD oils was also investigated.With some commercial oils, in both controlled tests and field experience, excessive wear sometimes occurred after extended service, even with recommended oil-change intervals. Generally, protection from excessive wear was best provided by those oils containing pre-dominantly alkyl ZDP (zinc dithiophosphate) antiwear additive instead of aryl ZDP. These results show that a laboratory engine test is needed to evaluate the long-term wear protection of engine oils.
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