Are there any negative affects of changing from one synthetic to another at this stage in the cars life. The previous owner doesnt know/remember what oil was used :nonono: Any suggestions would be helpful. Im going with RP HPS 5W-30
my tuner recommends amsoil, so i made the switch from a long time user of royal purple. they said that royal purple wasnt something they recommend, but for the life of me i cant remember what his reasons were. but he had a few, and he felt very strongly about it. so i quit using it.
Where you stationed?
With my Mach the previous owner only use royal purple so that's what I ran. S far as my cobra I'm running what the previous owner ran which is 5w-30 Mobil 1 synthetic.
IMO it wouldn't hurt the car at all to switch oils.
I ran 5w-20 once and that's when I killed a couple pistons (intercooler pump failure). MHP told me after my engine rebuild to only run 5w-30. That's all that goes in now.
Fort Meade, MD. Were you/ are you in?