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- From: Cliff_Lum@mindlink.bc.ca (Cliff Lum)
- Newsgroups: rec.autos.tech
- Subject: Re: Redline MTL for Miata - GL-4 vs GL-5
- Message-ID: <14307@mindlink.bc.ca>
- Date: 15 Aug 92 02:07:54 GMT
- Organization: MIND LINK! - British Columbia, Canada
- Distribution: world
- Lines: 32
-
- > Mike Suter writes:
- >
- > Msg-ID: <1992Aug13.205446.925%jim.uucp@wupost.wustl.edu>
- > Posted: Thu, 13 Aug 1992 20:54:4
- >
- > Org. : BITS, St. Louis, MO
- >
- > samuels@mcclb0.med.nyu.edu (Herb Samuels) writes:
- >
- > >What is the difference between GL-4 and GL-5 manual transmssion fluid.
- > >Redline sells two manual transmission lubricants for the Mazda miata.
- > >One is MT-90 which is a 75w90 GL-4 and the second is a 75w90NS GL-5.
- > >The NS stands for no slip and they said it has a higher viscosity than
- > >the GL-4. Someone else told me that GL-4 was of higher viscosity than
- > >GL-5. Are there any inherant advantages of GL-4 vs GL-5 or GL-5 vs
- > >GL-4. The Miata Manual indicates that either GL-4 or GL-5 can be
- > >used.
- >
- > I just battled all of this a month or so ago. If I got it right,
- > GL-4 is meant for manual transmissions, and GL-5 is meant for
- > differentials. GL-5 has additives which will corrode the synchros
- > in a transmission expecting GL-4, so use GL-4 unless specifically
- > told to do otherwise. (GL-5 and 6 do not replace GL-4)
- >
- > Look in your manual to find the correct weight. Call Redline
- > and ask for their techie.
- >
- > It is true that regular petroleum based GL-5 diff oils have corosives in
- > them but according to the RedLine Tech literature their Gear oil 75W90 NS
- > does not contain any corrosive additives that will eat at the synchros so if
- > a GL-5 oil is recommened you can safely use Redline 75W-90 NS GL-5.
- >
-