Serviced my diff. Redline 10w40 full SYN. when almost new. 2013 left over.
Installed DR P. sliders today almost 6k now. Ser. again today oil was black does this seen normal?
Maybe oil? Didn't use that again,when with Mobil One 10W40 motorcycle . I'll check that at next oil change.
I like DR. P. sliders 28G Its not much faster 0-30 but pulls harder from there up. Lowered RPMs at upper speeds great I run it hard.
DR. P easy to install. A lot of belt dust in case cleaned it out other than that everything was good.