Posted by pwyld on June 09, 2016 at 05:04:00 from (107.198.107.206):
My tractor manual (IH 300U) recommends straight SAE 20 oil for my engine cranckcase. I can find SAE 30, but finding it a little difficult to find straight SAE-20.
My question is can one use 5W-20 weight auto oil as a substitute? My understanding is the 5W is for cold starting in the winter, but when the engine gets hotter the viscosity will become a 20 weight at operating temperature.
I understand that automotive oil will have additives in it, but would this really be harmful to a gasoline tractor eingine or would it be better?
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