I had a full head of hair before I started searching this forum for info on trans oils. Data overload ! I would like to switch to Spectro in my 5 sp, but I read the GL-1 rating is inferior to what is needed in a bike trans. Will the 6sp GL-5 rated oil work in my 5 speed? Also, which weight? 75/90 or 75/140 ? Maybe I should just go with Mobile 1. I want to get away from HD F+ in the trans.
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