change to redline mt90 and now :((((
Just the opposite you goof! 
Redline:
MT90 Tranny
75W90 Diff'l
It is a bit lighter than OEM in the tranny but I like it and have no issues. I too changed around 20k and now have about 25k.
Redline:
MT90 Tranny
75W90 Diff'l
It is a bit lighter than OEM in the tranny but I like it and have no issues. I too changed around 20k and now have about 25k.
that's because your using mt-90 you goof. It's too light and doesn't allow the syncros to align fast enough cause it's too thin. You need redline 75w90 NS for the tranny and the mt90 is for the diff. Now you can add a bit of MT90 to your tranny oil(75w90) if you so choose but 90 all by itself is too damn light.
Why does Everyone keep quoting My first post which was wrong and I stated it to be wrong. Let it go folks let it go. I got ahead of myself and put 75w90 when I meant MTL it's been so damn long I forgot Its ok though keep on keepen on.
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Joined: Oct 2009
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well i'm a good driver, never miss a shift or at least not often! but now, my tranny is getting worst then ever! very difficult to shift 4th and 5th at high rpm! please someone, advise me for the cream of the cream of tranny oil! or any thing i could mix to thickin my mt-90 to help those 4th & 5th gears!
Lubricious
Joined: Oct 2003
Posts: 3,425
Likes: 4
From: SF Bay Area, California
MT90 is 75W90 GL-4, and widely successful in RX-8 manual transmission. It has proper friction for synchronizers, and none of the GL-5 worries about whether or not yellow-metal is protected.
MTL is 70W80, and has been found generally to be too light for the RX8 manual transmission. Possible exception in extremely cold climates. And, along those lines, some people mix MT90 and MTL.
Stop dragging MM away from his tunes and do your own research noob! (j/k)
http://blackhaloracing.com/technical...abs-eneos-uoa/
http://blackhaloracing.com/technical...abs-eneos-uoa/
Ordered 3 quarts of Eneos 75w-90 myself instead of Redline Mt-90. I'm sure Redline MT-90 is good too, but after reading the statistics on BHR's site, I rather use something that is backed up with info.
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Joined: Apr 2005
Posts: 10,880
Likes: 340
From: Australia
that's because your using mt-90 you goof. It's too light and doesn't allow the syncros to align fast enough cause it's too thin. You need redline 75w90 NS for the tranny and the mt90 is for the diff. Now you can add a bit of MT90 to your tranny oil(75w90) if you so choose but 90 all by itself is too damn light.
Redline MT90 GL4 IS for your Tranny, I like may others here have been using it for many thousands of miles and have had great reports..in fact this is the first I have heard of any high RPM change issues with MT90...
The 75W90 GL5 is for Differential (LSD one).
GL4 (Trans) and GL5 (Diff) is what the factory recommend.
Many have had problems with GL5's in the Manual GearBox.
Super Moderator
Joined: Apr 2005
Posts: 10,880
Likes: 340
From: Australia
I suggest you go back and "Edit/Correct " your comments and you won't get " your a Goof" replies..
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