Miata Mailing List: July 1993, Message #25
sponsored by



     


   From: Herb Samuels 
Subject: Re: Transmission Oil
   Date: Fri, 2 Jul 1993 18:58:25 -0400


As far as I remember, the Miata Manual (1990) specified 75W-90 GL-4
for manual transmission fluid.  They may have mentioned  a GL-5 as
well.  However, some mechanics do not recommend GL-5 oils for
transmissions (O.K. for differential) since they may have a high
sulphur content and slowly affect the synchronizers.  I don't know
what transmission fluid is installed at the factory but it is
certainly NOT ATF.  However, it is true that some manual transmissions
may use ATF but this is not true for the Miata.  Watch out for the
Dealers since many know very little and they can ruin your car if you
fully trust them.

Herb Samuels