Well I changed the rear end oil in my 1951 Farmall h a few months ago. I am pretty sure it still had the original stuff from the factory. I thought I would be smart in doing this because it too looked like cake batter.
Refilled it with 90 weight mineral gear oil. Tranny/rear end now makes quite a bit more whining noise compared to what it used to. I wish I would have left the cake batter stuff in there as my stuff was not water contaminated (but it both looked and smelled nasty). Unfortuantely, I had already discarded the cake batter stuff or I would have simply put it back in there had I still had it.
Anyway, if you dead set on changing it then I would go with 85W-140 (in GL1-through GL-4 spec grades) from NAPA or somewhere similar. Most of the GL-5 grades of oil that you will find at all the discount marts can eat brass and bronze bushings in your tranny....so I personally would not risk those....but if you feel lucky risking a ruined tranny in order to save a few dollars then go for it.....
I will eventually change my ole h again when time and money allows. Plan to go with 85W140 (GL1-through GL-4)
This post was edited by rankrank1 at 07:56:45 07/26/14 2 times.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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