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Why not use multigrade? 120-130 1967

posted by  matt b on  Mon Jan 14 03:41 CST 2002
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last visit: Tue Oct 14 16:33 CST 2014
[RELATED]

I've seen many overdrives gummed up by gear oil....usually the Jiffy Lube type folks that don't know what needs to be in there. Sometimes draining them and replacing with thinner oil gets 'em going, sometimes it doesn't. Admittedly, many manufactures have used the Laylock overdrives, but that is not to say that they all use the same fluid. Manufacturer recommendation....

As for multigrades...keep in mind that a 10w40 is designed to act like 10 weight in the cold, and 40 weight when warm. Warm being like a warm engine where the oil can be upwards of 250-300 degrees F. A transmission under normal operating conditons would never get that hot, thus, the multi-grade 10w40 would be somewhat more like running 10-20 weight all the time. Not a good idea in my opinion...

-Matt





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