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Old 15-03-2015, 09:35   #16
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Re: SAE 15w-40 instead of SAE10-30?

we`re getting pretty technical!! oil is oil, is oil! samo with an engine! i used #30 in older chevie 3 cyl that called for 5/30...not a problem...for that little engine in your boat, i would go to walmart, get some 'mobil 1', 10/30. get the amt of oil the engine uses, with a coupla spares...if synthetic scares ya, i have high regard for valvoline, 'all fleet' for diesels...great oil! get some #30 or 10/30, and never look back! also, delo, which is good oil, but way to expensive, now has gotten away form 15/40, and now pushing their new 10/30...D-E-L-O means...'diesel engine lubricating oil'...the tolerences in newer engines, are much tighter, hence thinner oils, like 0/30, etc...clyde

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Old 15-03-2015, 10:38   #17
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Re: SAE 15w-40 instead of SAE10-30?

Originally Posted by Catalysis View Post
You shouldn't have any problems substituting with 15w-40.
You are essentially getting the same protection over a wider operating temperature window.
You are likely buying more performance than you need but keeping your lube inventory simple has merit.
Go with a well known marine lube brand like Chevron's Delo or Shell's Rotella and you'll be fine.

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Unless someone can give specific reasons against, I would suggest looking into Amsoil synthetic lubricants. I have used them in my engines, both gasoline and diesel for years and get much better performance and mileage from the reduced friction.
They make marine oils as well.

AMSOIL - Synthetic Oil, Motor and Engine Oil, Lubricants, Air Filters, Oil Filters and Greases

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Old 15-03-2015, 17:39   #18
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Re: SAE 15w-40 instead of SAE10-30?

The only issue with alot of boat motors is oil leaks, and synthetic will find those littoe leaks and make them seem worse. As for yanmar filters I had 5 defective oem ones I threw out. They use s9me kind of sealant around the base and there were big globs ready to separate and go into the motor.
Sticking with fram

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