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4 stroke marine oil


Rizzo

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Sad day...winterized the boat today. Had a tough time finding 10w30 4 stroke marine oil BUT I saw tons of 25W40 4 stroke marine oil. I had never noticed this type of oil before. Is this what is being recommended now for 4 stroke engine oil? I did find eventually some 10w30 and bought it but was surprised how much of the other I was seeing (maybe there was so much because nobody buys it!) My engine is a 90 hp Yamaha 4 stroke from 2013 if that makes any difference.

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Oils oil.is it not?  Melt some lard like the old days before you and I, and pour it in. I know a deal on seal fat. Super slick.lol

29 minutes ago, Rizzo said:

Sad day...winterized the boat today.

And yet, so south of Barrie. How can that be?

 

It had to come Rog.

 

I am sitting here smelling smoked brisket on ye way. Steel head sides to follow.

Can not say,I feel yer pain,,,,,,,,,,,

Wait, I do,,,,,,,,,,,,,,,,,,,,,,

 

Cheers bud

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Googled it and found in general...

"Mercury Marine says it spent the last five years developing a new line of four-stroke marine oils, featuring three formulas designed specifically for outboard and inboard/sterndrive engines. The two key four-stroke oils in the product line have a 25W-40 viscosity rating, and are produced with either a semi-synthetic or straight mineral-base stock formula. The third oil in the lineup is a 10W-30 mineral-base stock oil intended for use in rope-start outboards because it’s easier to pull over in a cold engine… call it duck hunter’s oil."

Here due to a generally colder climate the thinner oil is recommended. Since you musky hunt in colder weather at times I'd stay with the 10W30 thinner oil. 

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Any good quality synthetic motor oil that meets the specs will do the job just fine. I use Motomaster synthetic gear oil in my lower unit, better than the semi synthetic stuff marinas use. I run whatever 20w50 dyno oil I find on special in my i/o, the key being yearly oil changes. 

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1 hour ago, captpierre said:

So my marine Yamaha 10w30 jug says it has additives in it specifically designed for marine engines exposed to high moisture environments. Are you guys using automotive oils?

No, we use this: https://www.amsoil.com/shop/by-product/motor-oil/marine/10w-30-synthetic-formula-4-stroke-marine-oil/?code=WCTQT-EA

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