I change my oil as often as I can with my 04 6.0 gasser I changed it @ 1000 ,2000 then went to mobil 1 @ 3500 and changed it every 4500miles, with the new LBZ I changed it @ 1000 rotella T will be doing it again @ 3000 w/rotella , when should i be thinking about going to mobil 1 and what interval, I know it is over kill but I like clean oil and do not mind spending a little more money to keep the crankcase cleen