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Im changing the lower unit oil on my 1978 mercury M800 80HP...the book says to use 85w-90 oil...im seeing 80w-90 and my local shop...is there much of a difference? can i use 80w-90? any help would be great...thanks alot
Im changing the lower unit oil on my 1978 mercury M800 80HP...the book says to use 85w-90 oil...im seeing 80w-90 and my local shop...is there much of a difference? can i use 80w-90? any help would be great...thanks alot
