Originally Posted By: Scuderia
Originally Posted By: PurplePride
I definitely had more noise on my Scion tC with M1.
I used 5w30, then Toyota changed the spec to 5w20 - both seemed noisier than the previous Kendall GT1 and the subsequent GC 0w30.
Since then, all RP 5w20, which is nice and quiet.
FWIW, I also used M1 20w50 in my Honda Superhawk 996 V-Twin.
Still has that in it - but it's in storage...
I can attest that M1 did make my tC noisier as well. I don't have unfounded hatred for M1 though. I certainly love M1's syn ATF in my powersteering, and in the tranny of my other cars.
So, what are you using now?