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Subject:Re: GL-5, GL-4, Redline, Sta-Lube, Royal Purple...
From:Mike S
Date:Mon, 12 Mar 2007 13:05:02 -0400
At 11:49 AM 3/12/2007, Geza Polony wrote...
>The curious thing is that so many have good results with Redline
>MT-90, and
>I don't. This isn't an issue with corrosion of yellow metal--I think
>the
>manufacturers of GL4/GL5 rated oils must have dealt with that. It's an
>issue
>of getting the shifts smoother. And it would seem that the the thinner
>Redline would do the trick,  but it doesn't.

The thinner Redline is MTL, which is a 70W80 GL-4 oil. MT-90 is 75W90
GL-5/MT-1.