At 01:25 PM 4/22/2010, Marc Sayer wrote...
>MTL and MT-90 are not for use in transaxles or differentials with
>hypoid
>gears, which means not for use in VW transaxles. Redline says, not for
>use with hypoid gears, right on their website. I love these products
>and
>all the Brit and Jap cars I built got them, but I wouldn't use them in
>a
>VW transaxle.

You seem to be confusing hypoid gears, which are only rarely found in
transaxles, with common helical ring and pinion gears, which often are.

Redline says: "Red Line MTL may be used in transmissions which
recommend 75W, 80W, or 85W GL-4 gear oils, or SAE 30 or 5W/10W30 motor
oils. If a 90W GL-4 or SAE 40, 10W40, or 15W40 is required, MT-90 may
be used." - that would include our VW transaxles.

Also: "Most manufacturers of manual transmissions and transaxles
recommend an 80W or 90W GL-4 lubricant. GL-5 gears oils which are
required in hypoid differentials are not used in most synchromesh
transmissions because the chemicals used to provide the extreme
pressure protection can be corrosive to synchronizers, which are
commonly made of brass or bronze. Typically, the use of a GL-5
lubricant in a synchromesh transmission will shorten the synchronizer
life by one half. The extreme pressure requirements of spur gears and
helical gears found in transmissions are not nearly as great as found
in rear-wheel drive differentials. A GL-4 lubricant provides adequate
protection for most manual transmissions, unless a unique design
consideration requires the extra protection of a GL-5." and