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Re: 3 Speed trans oil 90W?
FWIW, I just changed the oil in my SM420 to the straight 90 GL-1 that NAPA sells (part number "NHF 65201"--says 65-201 on container). Initial impressions are that it certainly seems to shift quicker with the GL-1. And it's "cheap" @ $13 a gallon, too. Works for me!
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