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engine oil

gado I have a 56 Massey Harris 50 that I want to change the oil on. The previous owner used 30 non-detergent oil, is this correct? I think it calls for 10W40.
ponymare Back then non detergent straight weights were all there was. If you want to go with now days oil, you might want to remove the pan and see how much sludge is in there.
gado Thanks, that's a good idea because I know there is at least an inch of sludge in the bell housing. I had to push a wire into the drain hole to get it to drain due to a leaking rear main seal.

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