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#1 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 6,370
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I have never seen a Ford recommendation for 40w oil, but I haven't seen everything.
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#2 |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,818
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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."
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