Saw, if you're using a 10-40 oil for cushioning bearings, better rethink that idea. Any multi-weight oil stays the consistency of its minimum weight rating all the time. For instance, a 10W40 is the physical viscosity of a 10 weight regardless of temperature, it just lubricates like a 40 weight when it gets hot. To get any cushioning advantage, the lower rating would have to be increased, like a 20W50, for instance. That one stays the thickness of 20 weight all the time, but lubes like a 50 weight at its maximum temperature rating. Ditto for 85W140 gear lube. BTW, I assume you know the "W" stands for "winter", not "weight" like some people think. The lower viscosity rating is measured with the oil at zero degrees Farinheit, I believe.

OK, I'll climb off the soapbox for a while! I believe the 10W40 restriction from GM had more to do with overheated engine components than it did with any actual failure of the oil, but for a few years there in the mid-80's, they sure discouraged customers from using 10-40!
Jerry

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