I have done the Auto-Rx thing for my transmission and engine, has anyone done this on there Differential and what were the results, meaning when you changed the Differential fluid did it come out dark, any information would be greatly appreciated.
I've used it in 2 difs. One I just changed, the other is still in.
The oil looked slightly dark, but not like what you see out of an engine. I was trying to get rid of an additive that I had used previously so that was my reason for using ARX. No proof either way as to results. Dif still works fine.
