gear oil

[inairam]

I had a chocolate Milkshake mixture in trans and rear diff. I appreciate all the input.
xrcr

I had that. I had to do a change in the cold because it was in a snowplow tractor and I could feel the gear shift be sluggish. Now all winter-run tractors will get a trans oil change in the late fall.

My bottom line on oils is that if the engineers at IH had access to modern oils they would be have been specified in the manual. The manuals were written before the modern oils were really around in the mid-1970s. I use the modern multi weights with better properties. In this case "doing per the manual" is not the best option.

[Don McCombs]

Probably best to start a new thread on this new inquiry.

[xrcr]

Good point Mr. McCombs I was being lazy......

[Greenthumbfarms]

I think the only time I have used straight 90 weight oil in the last 5-10 years has been in the transmission of my International Scout, which calls for a specific type (I don't recall if GL1 or GL5) for the bronze bushings in it.

Must have been GL1 which is a straight mineral oil and compatible with yellow metals like bronze bushings. GL4 and GL-5 gear oils contain extreme pressure additives that are corrosive to yellow metals. The PTO shaft pilot bushing is bronze. GL1 motor oil is pretty scarce these days, but you can also use Hytran, which can be used with yellow metals.

Gl-1 is correct, I checked the bottle today. I remember going to buy it in 2019, the kid at Napa looked in the computer and said he couldn't get any. I ended up finding a 2 gallon bottle on a dusty shelf in the back of the store.

[Clemsonfor]

How about 85-140 for a tractor used exclusively in the summer
Jim. P S. Might help quiet the gears some.

Won't hurt it one bit. There heavy gears that will still get oiled but probably overkill. And I'd hate to have it if you live in cold temps and then think I'd feel it necessary to change it out in winter, worried it wouldn't lube well...of course if it never got up to operating temps it should still act like 85w.

[Clemsonfor]

Tractor Supply sells a GL-1 90 weight gear oil called Ford Tractor Transmission Fluid.

Yep, that is what I use. It is made by Traveller.

Really it's made by Warren...and I think in the last year it may be a different company now?