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The Canucks say that GL5 has something in it that can damage the brass synchros. I'd go by what the FSM says. My $.02.


From Mitsubishi Motors TSB - MMSA TSB-93-22-001 "MT Transaxle Gear Oil" (April 1993):

"The manual transmissions/transaxles in Mitsubishi Motors vehicles require the use of API GL4 classification gear oil. Using an incorrect API classification gear oil may affect the shift effort and may cause transmission/transaxle component damage.

Use only gear oils having the API Classification GL4.

Mitsubishi Diamond Gear Lube - A991ZC2X01 - SAE 75W - 85W GL4 meets this requirement.

CAUTION: Do not use gear oils having an API GL5 classification. GL5 oils have additives which may chemically react with sintered copper synchronizer rings leading to manual transmission/transaxle damage."

FYI.

Eric W.

'89 Dodge Raider -- 3.0L V6, MT, SWB