[V8] Hex size and MT-90/MTL

[Steve Buchholz]

I must say that I've decided not to use Red Line MT-90 (or MTL) in my transmissions.  On my '88 5kCSQA I replaced the tranny lube at around 90k miles, and by 140k the 2nd gear synchros were gone.  No question that shifting feel was improved with the MT-90, but since the cars live in mild climes they don't need the thinner stuff ...

Fortunately I was able to get a NOS transmission to replace it ...

Steven Buchholz

----- Reply message -----
From: allanvega at comcast.net
Date: Tue, Aug 10, 2010 3:33 pm
Subject: [V8] Hex size and MT-90/MTL
To: <qshipq at aol.com>
Cc: <v8 at audifans.com>, <toml99 at todomundo.com>


Well there you have it, I stand corrected :) Would have been nice to know before plucking $20+ per litr for the o.e. stuff in my car.....live an learn I guess. Thanks for the link. Al 
----- Original Message ----- 
From: qshipq at aol.com 
To: allanvega at comcast.net, toml99 at todomundo.com 
Cc: v8 at audifans.com 
Sent: Tuesday, August 10, 2010 11:28:23 AM 
Subject: Hex size and MT-90/MTL 


To the question asked: Fill plug is a 17mm hex. Tip: Take the fill off before the drain. That way if you end up needing to order/booger the fill plug to get it out, at least you don't 'have' to do it right now! 

Allan, MT-90 is indeed GL-4 *and* is a 75w-90 as specified for the Audi manual transmissions 
http://www.redlineoil.com/product.aspx?pid=46&pcid=7 

MTL is a 70W 80 fluid, which would be a fine substitute if MT-90 is not available. IME, the MTL is better in cold climes, and is the recommended fluid swap for those manual transmissions operating at higher altitudes. 

Given the mileage on most v8 5Speeds, I would opin that either of the above fluids is absolutely fine for Audi Manual Transmissions. I have found that the MTL tends to have less balky shifts when cold (worn synchros), and consider either of the above to be just fine. 

That said, strictly sticking to Audi "Recommended" MT-90 is the GL-4 75W-90 weight synthetic gear oil specified for the Audi Manual Transmissions. 


Scott J 









-----Original Message----- 
From: allanvega at comcast.net 
To: toml99 at todomundo.com 
Cc: v8audi <v8 at audifans.com> 
Sent: Tue, Aug 10, 2010 7:31 am 
Subject: Re: [V8] What size hex on 5-speed tranny filler? 


Tom, do you know which redline oil was used to fill you transmission? If you 
used their 75w-90, that's a gl5 and not yellow metal safe (no good for the 
synchros in our cars). The only gl-4 that Redline makes, that I know, of is MTL 
and MT-90 ,neither of which is a 75w-90. (what out manual transmissions call 
for). The only gl-4 fluid that's is both synthetic and correct weight that I 
have been able to find, is the factory fluid (g50) 
----- Original Message ----- 
From: toml99 at todomundo.com 
To: "v8audi" < v8 at audifans.com > 
Sent: Monday, August 9, 2010 11:51:19 PM 
Subject: [V8] What size hex on 5-speed tranny filler? 

Hey, while I was under there today, wanted to check the tranny 
fluid. Car was refilled w/ Redline just before me getting it, and it 
doesn't leak, but just wanted to check it. Assuming I'm going to 
take off the upper hex plug(drivers side) and feel for fluid? I 
didn't possess the large enough hex, and was wondering if anyone 
know's the size?....Tom 

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