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Quote:
Originally Posted by nkaminar
The 600W oil was good in 1930. (600W does not mean that it is SAE 600 weight.) But that was 90 years ago. The modern gear lube oil has additives that will extend the life of your gearbox, over drive, rear end, and steering box. The multi grade means that it will act like SAE 85 when it is cold and SAE 140 when it is warm. So you shouldn't have the problem with stiff shifting when cold.
There are two versions of the 85W-140 gear lube, G4 and G5. Mitchell recommends using the G5 which has twice the additive than the G4. However there have been some problems with the G5 in synchronized transmissions because when the additive wears off the synchro rings, which it is designed to do, it takes a little bit of the brass with it. It sticks a little too much. I have recently switched from G5 to G4 in my Mitchell overdrive and Mitchell synchronized transmission. (The additive wears off in preference to the metal underneath and then more gets deposited.)
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nk - thanks, very helpful discussion (and I know 600W is not SAE 600, but good to reiterate). I think I will switch tranny and differential over to 85-140, but hold with the GL5 at least as long as the Mitchell is within warranty since that's what they require (no brass synchro rings in either).