Yanmar 3YM30 engine oil

[pvb]

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There's an interesting thread from 2008 in the Sailboat Owners forum about this. An owner was confused by the manual warning. He queried it with a Yanmar distributor, and reported back to the forum - "Their response was that any oil with CF rating or better was OK to use with the 3YM30. Acording to the service person I talked to, the reason for the blurb about not using CG-4 or CH-4 was because Yanmar hadn't tested these type oils in their industrial engines a few years ago when they first came out with the CG-4,CH-4 ratings. They just inserted this caution in all their industrial manuals until they could test the oils with the ratings. According to the service person, the cautionary statement is obsolete now but hasn't been removed from their manuals."

That makes sense.

 

[RichardS]

There's an interesting thread from 2008 in the Sailboat Owners forum about this. An owner was confused by the manual warning. He queried it with a Yanmar distributor, and reported back to the forum - "Their response was that any oil with CF rating or better was OK to use with the 3YM30. Acording to the service person I talked to, the reason for the blurb about not using CG-4 or CH-4 was because Yanmar hadn't tested these type oils in their industrial engines a few years ago when they first came out with the CG-4,CH-4 ratings. They just inserted this caution in all their industrial manuals until they could test the oils with the ratings. According to the service person, the cautionary statement is obsolete now but hasn't been removed from their manuals."

That makes sense.

Indeed. I suspect that is always the case with engines and the oils available before or at the time of their development.

I'm running 20, 30, 40 and even a 50 year old engine on fully synthetic oils and they just go on and on with no oil consumption and no bearing problems.

If I bothered to find the manual for these engines I can guarantee that anything but mineral oil would be strictly verboten, if only because nothing else existed.

Richard

 

[TernVI]

I think CG oil came out in about 1987, so Yanmar had plenty of time to test it.

CH-4 came out in 1998, so I'd suspect any oil which meets CG but not CH is either very old or specifically not as good as (or deliberately different from) CH.