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I wonder about this: In my '98 Subaru, somebody put the wrong lube in the transmission (5 speed stick) and it wouldn't shift well when I got it. I had the lube replaced with the right stuff and now it's all better. The problem is that the synchros require a certain weight and amount of friction to work right. If you put in something slipperier, they hold you out of gear.
I don't know if this is just Subaru's, or if other transmission makes will have similar issues.
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