Date: Wed, 6 Sep 2000 19:20:43 -0500
Reply-To: John Rodgers <inua@HIWAAY.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: John Rodgers <inua@HIWAAY.NET>
Subject: Re: no GL-4 available
Content-Type: text/plain; charset=us-ascii
Mark, its my understanding that one of the characteristics of the MT90 is that
as a synthetic it has long-chain molecules deliberately put into the oil as part
of it's make up. This increases the shear strength and reduces the tendency of
the oil(as with any oil) to run off the gears, thus keeping it where it is
needed most during operation----between the gear teeth, and on the bearings,
where a LOT of shear wear is taking place.
John Rodgers
88GL Driver who is happy with MT90 in the tranny
Mark Dorm wrote:
> This is paragraph one from the section covering MT90 @ www.redlineoil.com :
>
> RED LINE OIL
> Manual Transmission / Manual Transaxle Lubricant
> TECHNICAL INFORMATION
>
> RED LINE MTL and MT-90 are designed to provide excellent protection and
> improved shiftability for manual transmissions and transaxles. MTL and MT-90
> have cured the problem of hard shifting in numerous transmissions which have
> notoriously difficult shifting. The secret to their success is two-fold.
> First, 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. Secondly, the viscosity
> characteristics 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.
>
> >My point is,
> >isn't MT90 a 90 weight gear oil? Why would we use a heavier single weight
> >oil than recommended by the manufacturer? What am I missing here?
> >
> >Mick Kalber
>
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