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Hi -- I need sae 10w oil for the blower gears on my 1978 MC8. (old greyhound, 8V71) So far I am only finding non-detergent 10w and big pails of 10W. I am curious if there is a way to add detergents to the oil or i sthat a good idea? Is there any kind of substitute for 10W? I think if I was down...