Miata Mailing List: November 1997, Message #178
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From: 	EScheidl@aol.com

Subject: (none)

Date: 	Sun, 2 Nov 1997 17:25:25 +0000



 of mention referring to the use of Red Line MTL in the

transmission to improve shifting ease and tranny longevity, but I never see

anyone refer to the use of Red Line MT-90.  I have been researching Red

Line's product line since my 93 has 40k on it and I want to switch to a

synthetic gear oil.  It appears to me from my research that the product of

choice would be the MT-90.  The MT-90 is a 75W90 GL-4 gear oil whereas the

MTL is a 75W80 GL-4 gear oil.  My owners manual says to use 75W90 GL-4, GL-5

gear oil, and in temps. above 50 deg. F (10 deg. C) to use 80W90.  The

literature that Red Line sent me says that the MT-90 "uses the same chemistry

as MTL, but is a 90 WT in order to satisfy certain manufacturers which

recommend SAE 90 GL-4 gear oils".  Is it just that the MT-90 is a new product

and nobody has had a chance to try it yet?  Or is the MTL really better

suited to the Miata's transmission.  Any comments will be greatly

appreciated.



Thanks;



Ernie Scheidl

93 Base Classic Red (Hard Top on for the Winter) :-(

Drain, OR