Miata Mailing List: July 1996, Message #123
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   From: Miatas@learnlink.emory.edu (Pat McCartin)
Subject: RedLine 75-90/NS is NOT appropriate
   Date: Tue, 2 Jul 1996 09:41:35 -0400

Hey Everyone,
After reading the note in Miata Mag, I called my conection at Red Line.
Who after a long
discussion. Came to the conclusion that 75W90 NS   MAY   cause
degradation of the 
brass syncro rings.
This is due to the additive they have to put in the oil to bring up the
non-shear/slip
property.
75W90NS is also a GL-5 grade oil which is overkill for the Miata

As always I stand by MTL or MT-90 for the Miata.

Pat McCartin
Brain-Storm Products

P.S.
Norman Garrett and Miata Magazine are aware of the problem, and are
conducting there own research to update the info.