[s-cars] Red Line transmission oil

[LL - NY]

I used MT-90 in my 200, which recovered the synchros that I thought
I screwed up by using Mobil 1 75W-90 supposed GL4/5. I chose the MT-90
over the MTL, since it meets the factory recommended viscosity range.
IF you drive
hard or intend to track the car, I'd go with the heavier weight oil,
which will leave
a thicker film on the gearsets at at the bearing journals, which would
be crucial
in hard use for proper hydrodynamic lubrication. Also, the greater the
HP output
you intend to use, the more you want a thicker oil film. 

I have also found that the MT-90 shifts perfectly fine (like, I notice
no difference all year long) even in rather cold environments, of
which I've been experiencing lately, like -4 to -10 degrees F. In
otherwords, I'd return the 70W-80 and go with MT-90, especially since
you're in a warm enough area that you really don't need the lighter
weight oil anyway.

LL - NY


On Thu, 24 Feb 2005 22:49:16 -0500, Igor Kessel <KBATPO at comcast.net> wrote:
> Folks,
> I am confused. The Red Line site states:
> "Red Line Oil's MTL and MT-90 are designed to provide excellent
> protection and improved shiftability for manual transmissions and
> transaxles, having cured the problem of hard shifting in thousands of
> transmissions with shifting troubles. How? They have the appropriate
> coefficient of friction for most manual transmission synchronizers (many
> gear oils, engine oils, and ATFs are too slippery for proper synchro
> engagement). And, the wide viscosity of MTL and MT-90 allow proper
> shifting over the entire temperature range which the transmission will
> experience. The synthetic base oils used have a very high viscosity
> index which provides relatively constant viscosity as temperature
> changes. MTL is a low 70W at very low temperatures and a high 80W,
> nearly an 85W, at elevated temperatures, providing adequate viscosity to
> prevent wear and deaden gear noise. MT-90 is a thicker 75W90 version of
> MTL. The shear stability and oxidation stability of these products are
> excellent, thus the physical characteristics of Red Line MTL and MT-90
> will change little with use. "
> 
> I think I had used MT90 in my 200TQ in the past. A few days ago I
> stopped by Zygmund Motors in Doylestown and to picked up some  MTL SAE
> 70W80 API GL-4.
> 
> OTOH ETKA calls for 75W90.
> 
> Should I return it and get the MTL instead?
> Also, should I get the "special additive BG116 BG E.P.C." from the
> dealer or is it not really necessary?
> 
> --
> Igor Kessel
> two turbo quattros
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