75Yamaha oil?

[penner]

For the last 6-7 years I have been using Sierra Synthetic Blend 10w-40 in my 2006 Yam 4stroke. I can't seem to find any in my area but CTC has the Mystic 25W-40 Synthetic available. Is it a bad idea to go from the10W to the 25W??

[Shellback]

I'd stick with what Yamaha recommends Glenn. I think 25/40 would be too thick to lubricate properly at the lower temps outboards run at.

[penner]

I was thinking the same after doing some more research. Had the Alaskan out yet Ron?

[MarkG]

Amazon carries the Sierra FC-W 10w-40 synthetic. Gallon jugs.

https://www.amazon.com/Sierra-18-955...8275383&sr=8-3
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