Dexron ATF in my Yanmar Trans Gear? - Page 2 - SailNet Community

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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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  #11  
Old 12-15-2008
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A site for ya'all

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Old 12-15-2008
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Seems like the general consensus here is that the yard should have used motor oil and NOT ATF.
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Old 12-16-2008
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This is an interesting discussion. I don't have a Yanmar. My Volvo tranny drinks the 15W-40 stuff, same as the engine, nice and convenient that way. Never heard of ATF on a boat, but it makes sense in a lot of ways. Many newer gear boxes, transfer cases & such use ATF. It is better for fuel economy, and probably better at resisting emulsification than heavier oils.

I think ATF is chemically similar enough to motor oil where it won't damage the seals, might actually help a little. However I agree that it would be prudent to have them put in the correct oil based on the published tranny specifications.
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Old 12-16-2008
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ATF is also recommended in some mechanical transmissions as it also has defoaming agents in it. I have know certain mecahnical transmission dump their oil through foaming, AFT was used and the problem went away.

Last edited by r.furborough; 12-16-2008 at 10:11 AM.
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Old 12-16-2008
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I can't believe that I've just read a thread where a consensus seems to be forming that you can substitute SAE 30 motor oil for automatic transmission fluid.

I'm speechless.

There's a lot of bad advice circulating on this site.

By the way -- You all do know that there's a difference between gasoline motor oil and motor oil formulated for diesel engines, right?
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Old 12-16-2008
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Old 12-16-2008
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I think the answer here is that the person needs to know a specific transmission model (which cannot be established based on engine model, since same engine can be fitted with different transmissions). So, we just don't know.
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Quote:
Originally Posted by brak View Post
I think the answer here is that the person needs to know a specific transmission model (which cannot be established based on engine model, since same engine can be fitted with different transmissions). So, we just don't know.
Perhaps you're right. I wanted to terminate what I thought was a developing acceptance of substituting ATF and motor oil before someone ruined their transmission. That's completely unacceptable. Maybe I'm just getting a little fed up with some of the answers I've read here over the last couple of months. Maybe it's the weather...
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Old 12-16-2008
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Hi all. I read this site a lot and love the information. To NOLA, I worked on cars in the 70's -80's and there were some manufacturers (I specifically remember Chrysler) that put ATF in their manual transmissions at the factory and allowed standard 10W30 to be used after the transmission had worn.

Yes - there are some applications that allow ATF or motor oil to be used. I don't know if this applies to marine transmissions, but it could! Check your facts before you berate others.

P.S. Yes, there is a difference in motor oil for gas and diesel engines.
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Old 12-16-2008
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Quote:
Originally Posted by AmicaJim View Post
Yes - there are some applications that allow ATF or motor oil to be used. I don't know if this applies to marine transmissions, but it could!
Rumor on the street is that Marvel Mystery Oil is basically just ATF with a couple tweaks here and there in the additive package. Think that is true? I haven't tried that in any manual transmission yet, and don't think I will, but I can attest it sure works magic in gas engines. Frees up stick lifters, stops leaking seals. It mixes quite well with oil. My truck was running really low oil pressure (stuck relief valve I think) after a quart of MMO and a couple trips around the block the oil pressure was back to normal and no more tap-tap-tap in the morning. A4 owners also swear by the stuff. Little off topic but just thought I would pop something into this thread before it turns to a poo tossing contest
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