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Re: Synthetic Gear Oil
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Posted by buickanddeere on September 07, 2005 at 17:08:07 from (192.75.48.150):
In Reply to: Synthetic Gear Oil posted by Trkr on September 07, 2005 at 12:58:32:
You have to watch out if it's 50 weight motor oil or 50 wt gear oil. Motor oil and gear oil weights are not the same. 50 to 60 wt motor oil is supposed to be close to 80/90 weight gear lube. Where you will get into trouble is synthetic vs mineral oil. A transmisison can be made smaller and lighter for the same amount of torque if the shear pressure of the oil is increased. When loaded, the mineral oil will be squeezed out allowing metal to metal contact. The GL-5 gear lube uses sulphur based high additives among others. When water from rain or condensation gets in there. Any copper based bushings etc will deteriate. As for weight vs clearances. Properly lubed parts ride on an oil wedge like a surf board on a wave. The narrower the clearances the thinner the oil must be to form a wedge.
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