What Oil and Filter are you using
Originally Posted by f150newf
Amsoil series 3000 with oil change every 45k and a filter at ever 25k. Oil looks as good as new.....Amsoil is the best...
Castrol Syntec / Motocraft every 5K miles or less. I drive in what could be considered extreme duty. Grinding stop & Go traffic during the work week, heavy loads and off road abuse on the weekends. If I were doing easy highway miles I would not feel bad about 7500mile intervals.


