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A toyota mechanic I ran into at the local autoparts store said he used to drive a honda and he said not to run synthetic in a honda manual tranny because the synchros need a certain amount of friction to work properly. He said synthetic is too slippery and will cause you to grind your gears and also lead to premature tranny failure. Sounded pretty sensible but also dissappointing as I was hoping to improve my fuel economy by running a lower friction synthetic oil in the drivetrain. On the other hand I would hate having to replace/rebuild my tranny, as the cost would seriously offset any gas savings from running synthetic oil in the tranny.
I like the recommendation to use Honda MTF but I am curious does Amsoil provide any kind of warranty or gaurantees their synthetic mtf will not damage a honda tranny?
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