I have a 10 hp yanmar disel engine in a 6500 northstar generator
They call for a 20W40 weight oil,I can't find that weight oil around here
Would a 15W40 or 20W50 be ok to use
Thanks
Better order it from AMSOIL.com or check a TractorSupply.com. It can be found online... but it might be more expensive then the 20X50w
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