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1925 Series 80


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600-W AKA steam cylinder oil.  Use this in the diff and the steering box, too.


Get it from Model T and A Ford parts houses.  Insist on the dark, smelly, viscous stuff, NOT the honey-colored stuff which I suspect is repackaged SAE 140.


Speaking of the steering box, do not be deceived by the zerk fitting.  Your car came with a pistol grip push-type small grease gun loaded with Pierce's "Special Compound"--which is 600-W.  If you put even a lever-type grease gun on that zerk, you will blow the seals.  If you don't have the "compressor, grease," unscrew the zerk and pour in some heated 600-W.

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