Transmission Oil

[Kloth, Gerald]

GL-4 is the stuff to use.  NAPA sells a brand, but I don't remember the
name.  At least they did a few years ago when I needed a quart in a
hurry.

Jerry Kloth


Date: Tue, 13 Mar 2012 00:23:54 -0500
From: David Pertuz <d.pertuz at gmail.com>
Subject: gear oil - GL-4 or GL-5?
To: se-r at se-r-list.org
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My former G20, now owned in California by a friend, is getting a new
clutch tomorrow. I was telling him some things to be aware of (to
mention to the mechanic, really, since he is not the faintest car
person) and I cannot remember whether GL-5 is OK for the trans in those
cars. I remember that the service manual calls for GL-4 - I'm certain
this is correct. I also remember that GL-5 may be bad for the synchros
in the long run, but I'm not certain of that. I also remember that when
I replaced the engine in the car years ago I absolutely could not find
GL-4 anywhere, and ended up using Castroil Hypoid C, which was GL-5 and
obviously worked OK since it was in there for ~80k miles and it always
shifted great. Is the correct weight of
GL-5 oil OK for the trans? I might have put Redline MT90 in there a few
years ago (I can't remember!) but this is not a situation where anyone
is going to be putting Redline in there.

thanks,
David
Chicago
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