hmmm.missus mazda 3.
was using penrite everyday syn 5w40.
engine has approx 130k.
went to motul 8100xcess.
feels alot quicker and more responsive.
might be the oil.
hairy muff.
each to their own.
my engine builder has recommended penrite.
I just have to find the right grade.
will be looking at going ten tenths.
hope they dont change their range again.
just one of those personal preference things.havnt heard anything bad about royal purple.
in the missus mazda 3, went from penrite 5-40 everyday full synthetic, to motul 8100x-cess 5-40, and could feel a decent difference by seat of the pants feel.