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Effect of Unleaded Fuel on Lubricant Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1971 by SAE International in United States
Annotation ability available
The performance of motor oils in engines run on unleaded fuels was evaluated using several makes of United States cars. These oils, SAE 10W-40 grades, were run in high mileage or turnpike service, as well as surburban service. The performance with unleaded fuels was not significantly different from that for leaded fuels in the areas of wear, sludge, varnish, or rust.
Valve seat recession was detected in several of the cars, but had an effect on performance in only one case.
Further testing using laboratory engines and a patrol fleet in pursuit service demonstrated the effect of lubricant composition on valve seat recession. In addition, it was found that engines preconditioned on leaded fuels afforded better protection against valve seat recession than new engines.
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CitationCrouse, W., Johnson, R., and Reiland, W., "Effect of Unleaded Fuel on Lubricant Performance," SAE Technical Paper 710584, 1971, https://doi.org/10.4271/710584.
- Stevenson D. J. “Availability of Additives to Meet the Changing Automotive Oil Quality Requirements.” Paper No. F & L-70-48 presented at the National Fuels and Lubricants Meeting NPRA New York September 1970