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 |
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