i just put Amsoil 5w-20 synthetic in today.. its rated to 6 months or 7,500 miles.. I'll probably change it at 6,000 though.RIP 112 said:Amsoil 0-30w or Mobil 1 5-30w. I used to run Royal Purple, but now I use Mobil 1 and I could never tell the difference. I have a hard time finding Royal Purple locally so the Mobile 1 does the job just as good. Amsoil is great, maybe the best, but it cost some $$$$$.
but i will be moving closer to work and soon and when i do i am giving my baby a break Too Slow said:I run 5w20 royal purple and use the motorcraft oil filter. no probs so far even with this texas heat.