Gear Oil in a M

F-Dean · Aug 17, 2013

What weight oil is best for an M transmission/rear end? 80W90 or 80W140

gene bender · Aug 17, 2013

either would be fine

D beatty · Aug 17, 2013

When I rebuilt the tranny on my M the Case-IH dealer told me to use 90 weight said 140 was to heavy.

BigTone · Aug 18, 2013

I use 80w90

David G · Aug 18, 2013

either are fine, I use 85W-140

Tom Fleming · Aug 18, 2013

Well, all the previous answers are fine, but I will add a little detail. Is this a show tractor or are you gonna work it? Show tractor, 80W90 is fine, and is also what I run.

If you are going to work the old girl, next question I have is what is the climate where you are at, and when do you plan to use it the most? Warm climate, hard work (plowing, disking, etc), I would go with the heavier lube.

If you live in MN, WI, SD, ND or similar, and plan to work her in the winter, like snow plowing, I would probably go 80W90 as well. If you live in a warmer climate, go heavier. All the older manuals I have seen offer pretty much what I just told you, except they say to add a little Kerosene in the winter, and then change it out in the spring. Gear lube is too expensive today to operate like that. Plus, today's gear lube has a much longer life.

IMHO.

dej(Jed) · Aug 19, 2013

What is wrong with you guys? You will be in trouble when the Hytran police see your suggestions. LOL.

Gear Oil in a M

F-Dean

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gene bender

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D beatty

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BigTone

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David G

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Tom Fleming

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dej(Jed)

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