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  1. M

    Running Amsoil 75W90 GL-4 in Trans, Replace?

    Hey All, I have an 05' Scion xA 5 speed that I purchased 3 and a half years ago with 62k miles on it. I changed the trans oil out at 70k miles with Amsoil 75W-90 and it now has 117k miles on it. Conventional wisdom tells me that I should change the fluid every 50k miles or so, but neither the...
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