Just got a Nissan 4 x 4 Truck with about 71K miles on it. I've had great results from ARX in engines and Automatic Transmissions but I've never used it on a manual tranmission. Do you think there is any reason to put it in my truck manual transmission before I change to synthetic? I just don't know if a MT gets much gunk in there or if gear oil "wears out" like ATF does.
