You should avoid running anything in your stock tank other than diesel. Oils (motor, atf, wvo) are thicker. You need a heated tank to run them PROPERLY. This lowers the viscosity for the engine to tolerate efficiently.
2002 F-250 Lariat 4x4 CC, 4" Magnaflow SS Exhaust, Wix 6637, Petes Cover, DP-Tuner