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A yamaha dealer recommended using chevron delo 400 oil for my 4 stroke outboards. They say that's what they use when doing services. Has anyone else heard of this? Would it void my warranty? Just want others opinions before my upcoming service.
as long as its the rated viscosity and the rating of FCW its ok, if not then yes it can void the warrenty.
if your in the US market.
in the US market your owners manual will give all the API grades that are useable.
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