[V8] What size hex on 5-speed tranny filler?

[allanvega at comcast.net]

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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