Miata Mailing List: July 1996, Message #230
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   From: LSAPEX@aol.com
Subject: Re: RedLine 75-90/NS is NOT appropriate
   Date: Wed, 3 Jul 1996 07:43:17 -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

I agree with this. MTL was specificaly designed for syncro transmissions.
My understanding was that the non-shear/slip oil was good for racing trans
with straight cut gears and no syncro's, also rear diff's.

As always, I could be wrong.

Lester Seal
Mass Miata
Team APEX 508-2298-0090