I have a 2003 Toyota corolla with a c50 manual transmission, and I can’t figure out which fluid to buy. I know it has to be 75w-90 and meets gl-4 or gl-5 api requirements. Researching a bit, I found that apparently some gl-5 fluids caused synchro wear. Do you know of a certain transmission fluid which is certainly suitable for the Toyota c50 transmission?
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