Freedom is not free
Join Date: Sep 2007
Location: Sioux Falls, South Dakota
Re: Rear and front axle fluid
I wasn't to happy about the Royal Purple UOA
results on the rear diff of my F-250. Only 33K miles and the fluid broke down to a 90 weight. The sample definitely wasn't purple anymore.....more like dark brown. I have Schaeffer's 75W-140 in there now with the Mag-Hytec diff cover. A few more trips to South Dakota and I will have 33K on it for a comparison. After that I might give Redline a try. Redline's products contain polyol ester base stocks, provides excellent high temperature stability and film strength.
2003 F250, Wildman tunes, Faubion trns, Swamps 175/146 SS,van turbo/WW, DI Intercooler, oilguard bypass, intank & pre-pump, reg return, Firestone air bags, Bilsteins, 350 HP/692 TQ
2000 Excursion- Pwrd by: T Wildman 6 pos chip, CT Performance Suspension, Riffraff Diesel Performance, J&M Tranny, 4" MBRP, 6637 filter, intank/prepump mods