Miata Mailing List: November 1997, Message #181
sponsored by



     



From: 	"John Freas" <jfreas@gte.net>

Subject: Re: MTL vs MT-90

Date: 	Sun, 2 Nov 1997 17:51:55 +0000



Previously on an untitled message to the list, (Ernie Scheidl)

EScheidl@aol.com said...



> It appears to me from my research that the product of

> choice would be the MT-90.  The MT-90 is a 75W90 GL-4 gear oil whereas

the

> MTL is a 75W80 GL-4 gear oil.



Technically MT-90 should be the best choice, but empirically it seems that

MTL does a better job.  Folks have surmised that MTL contains an additive

that makes the synchros work better whereas MT-90 is actually too slippery.

 Your literature suggests that this is not the case, but the results

remain.



I would say first and foremost, if your transmission is shifting well, you

don't need anything.  If it is working well and you want to change the oil

as a preventative maintenance move, then feel free to try the MT-90.  It

won't hurt, and you can let us know what you find.  If the transmission is

a bit grindy and you are trying to improve the shifts, again, you can try

MT-90 and see how it works for you.  I can tell you that MTL will

/definitely/ help.  If the MT-90 doesn't do what you want, the only loss is

the cost of the oil and a little bit of your time.



	-John



------------------------------------------------

John Freas (jfreas@gte.net)

Red '90 Base-ish #7690

Deer Park, Long Island

Team PBC

Team Roebuck

Team Voodoo

Team "I have no idea what those dimple things on the windshield frame are

for."

------------------------------------------------