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Forum: Early V8 (1932-53) 06-30-2013, 11:24 AM
Replies: 27
Views: 14,019
Posted By VeryTangled
Re: What should I use for oil in 40 Ford flathead?

Welcome to the Forums DP1743.

Those numbers are from the American Petroleum Institute's 'Service Classification' rating system. For starters, ratings beginning with C are for 'compression'...
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