Quote:
Originally Posted by J Franklin
I have never seen a Ford recommendation for 40w oil, but I haven't seen everything.
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Quote from the 1931 Model "A" Instruction Book: "In general an oil having the body of S.A.E. viscosity No. 40 will prove satisfactory for summer use. For winter use oil having the specification of S.A.E. No. 20 should be used. It is essential, however, that this winter oil have a low cold test."