It's a little perplexing...
On one hand the original Datsum manual specifies 80W-90 or even the heavier
140wt for higher temperatures as Mike indicated
But we observe that the notchy shift goes away as the tranny wams up.
This seems to imply that a overall thinner gear oil would be prefered,
such as the multi-weight 75w90 that is suggested by Rivergate and others.
It's contradictory, I mean that I would have thought that a thicker gear oil
would
help the action of the sychros, but that appears not to be the case.
I'd like to believe that I could put in a API-GL4 lube and my notchy shift would
magically disappear, but somehow I don't think that will happen.
Unless of course, someone else out there had a notchy shift and it went away
when they
swaped in Redline MT-90 or something similiar.
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