Old Library

>When it comes to Redline gear oil if the specs are not what VW recommends
>than they have the right to deny coverage if it can be proved.
>gear oil specs from VW are GL-50 synthetic or SAE 75/90w.
>
>Don


Redline meets the requisite GL-4 75W-90 with the MT-90 formulation.

In a letter from VW (I got two after writing a complaint letter to them
about not using redline or voiding warranty...)  they give specs as "02A
trans. 2.0L G-50 synthetic oil (BTW G-50 is the VW "brand name").  VW part
number G 005 100 A1.  The letter states that the API designatino GL-4 is
reccomended.  VW goes on to state in their letter to me that, "We would
like to inform you that should improper fluids be used that resulti in a
needed repair, Volkswagen may not warranty the repair."

In an earlier letter to me, they stated "...Volkswagen does not reccomend
any specific brand of lubricant, although we do endorse Valvoline through
our dealerships."  Then in the letter they added, "For warranty and
maintainance purposes, lubricants used for any Volkswagen vehicle must meet
the API specifications indicated on the enclosed documents."  The documents
list GL-4 75W-90 for the manual transmission and SJ for cars manufactured
after October 15, 1996.



*********************************************************
Brian Gracek			Saint Cloud, Minnesota, USA
Chemist			 	Vision Ease Lens
Proud Member of the Minnesota Air National Guard...Let Freedom Ring

Exactly what would the VW spec viscosity be??  I ASSume your
talking the 02A tranny.

I was told by VW Service guy that it should be......straight 80
weight!  So the MT90 is giving less protection??


Bob Brown

Gentlemen,
      The official specification for all VW manual transmissions (front
wheel drive) is G50 (synthetic) gear oil SAE 75W90.
Any synthetic oil conforming to GL-4 spec in the range of 80 or 90 weight
(single viscosity is fine. GL-5 should not be used due to its friction
reducer additives that make synchros ineffective in a manual trans. Earlier
Porsche (up to 86) used a different type of synchro ring that was more
sensitive to oil type and viscosity. Redline MT-90 or the multigrade
designed for manual trans is what we should be using. Multigrade is for
colder climates. Do not use either of these oils in automatic trans
differential sections. Hope this clears up some of the "rumors". I don't
judge products by what I hear from the "Porsche Guys". Most of them are
doctors or (sorry Wally) lawyers and don't know much about their
automobiles.
Bob C.



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	I editted the "quoted emails" portion in this email for
	better readability.  aqn.  99/02/27
    
    


Hey ya'll I'm back from a LONG period of away time...I'll whip out my 
chemistry degree and industrial experience to cover this one.

(snip)Reply is interweaved 

>>BTW, why is it that a "75w90" dinosaur oil will feel like 150wt oil 
>>in freezing conditions but a "75w90" SYNTHETIC oil will feel like 
>>butta in the same conditions??  Shouldn't the 75w signify that the 
>>oil is 75w when freezing?  Or is the shearing and cohesive 
>>properties that they measure?  I just don't see how a 75w oil can
>>be different from another 75w oil if they are supposed to flow the
>>same. Anyone know? 
>
>Ok...I'll bite, and bite HARD!
>The dynosaur oil, its molecules vary in size(like snow flakes).
>This will slow down the Flow! On the other hand the Syn oil, ALL of
>its molecules are the SAME SIZE. This lets the oil flow faster in to
>the tight clearances/parts.....etc.
>
>Should I bring out the Flame suit?

No, you are on the right track.

The ASTM Kinematic (kinematic = moving) Viscosity tests simply measure a 
certain ammount of torque on a spinning shaft.  The torque is due to the 
resistance of a liquid to the shafts rotation (constant RPM).  The units 
are cps (centipois).  A 75W-90 means simply that at the lower temp 
(around O degress C) the viscosity conforms to ASTM standards.  And at 
higer temps (whatever the test calls for) the oil conforms to 90 weight 
specs.

The viscosity measure is only ONE measurement of a fluid's (oil's) 
physical properties.  The syntheics have lower pour points, stronger 
film strenghts, better thermal (high temp) properties due to the nature 
of the formulation.  Waxes are common to dinosaur oils...the big long 
chains allow other molecules a place to "align" (this is a crude 
analysis) and thus give the tendancy to thicken quicker than 
syntheitcs...

In general synthetics have fewer VI (or viscosity improvers) than 
conventional oils so there is more "oil" in there lubricating.  

One final note, syntheics burn cleaner too. 



Brian M. Gracek (chemist)
Apple Valley, MN, USA


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Both MTL and MT90 are manual trans fluids.  Check out RedLines site for mor
info:

http://www.redlineoil.com/gearoil.htm

Jeff

-----Original Message-----
From: &#111;wner-gti-vr6&#64;cobra.ccsi<img src=/i/dc.gif border=0 width=35 height=15>
[mailto:&#111;wner-gti-vr6&#64;cobra.ccsi<img src=/i/dc.gif border=0 width=35 height=15>]On Behalf Of Chris Rogers
Sent: Tuesday, March 23, 1999 11:13 AM
To: &#84;omJV&#64;bestweb<img src=/i/dn.gif border=0 width=35 height=15>
Cc: GroupPost VR6
Subject: Re: [gti-vr6] Redline Tranny Lubes


I think the MTL is for auto trannies and the MT90 is for manual. Could be
way
wrong tho. You probably want the MT90.
-C
White 95 Golf VR6 (running MT90 edition)

Tom Venditto wrote:

> Ok, I checked the archive and no go-
> I'd like to do the tranny lube change to RL.  The archives state MT90.  My
> VW parts guy says MTL.  Is this the ticket?
> TomV
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>Ok, I checked the archive and no go-
>I'd like to do the tranny lube change to RL.  The archives state MT90.  My
>VW parts guy says MTL.  Is this the ticket?

Tom, MT-90 has the stock viscoscity spec, but I find it shifts worse in my
'96 GTi VR6 than stock when cold (50F).  I am about to change to MTL because
I have come to the conclusion that MT-90 is just to thick/slippery when cold
for the syncromesh to work properly.  Shifting is slow, required more force
and tends to grind.

After 30 minutes of driving the MT-90 is fine in my car, but I have only a
15 minute commute, so it has to go.

I am not concerned that the low temperature viscocity of MTL is lower - that
is why I need it.  Once up to temperature and working hard, MTL and MT-90
are essentially the same thing.

Peter

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