Re: 90 wt. or 80-140 multi- wt. oil??

Posted by Doug in OR on May 13, 2004 at 07:44:07 from (159.121.94.198):

In Reply to: 90 wt. or 80-140 multi- wt. oil?? posted by John on May 12, 2004 at 19:10:12:

I usually vote for the oil that is newer and better. In this case, I won't do that. First of all, I'll assume no hydraulics are involved. Next, GL-5 gear oil didn't exist when your tractor was designed. A common belief is that GL-5 is an acceptible or even better substitute for GL-4, or even GL-2. This is not the case. They are specified to meet different applications. The transmission of my Nissan is specified to use only GL-4. I made the mistake of using GL-5 in it, and guess what? Major gear grinding. The syncros just didn't appreciate the GL-5 composition. GL-5 was not designed as a replacement for GL-4.

My advise: Unless you know more about the oil you are using, I'd stick with the gear oil that your service manual recommends.

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