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I've always understood it to be that mixing oil weights is not harmful. Your weight just comes out to be somewhere in between. They probably used whatever weight they were putting in the engines for the climate. That said, I'd probably put in whatever the TM says.
Which brings us to, drumroll please... http://www.dtic.mil/dtic/tr/fulltext/u2/a416038.pdf
TL;DR the original driveshafts explode at ~66rpm which is only 17% higher than the max rpm with stock gearing, violating SAE standards, and also, the angles on the joints exceed best-practice standards in...
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