[naz]

ZED_not_zee,Oct 21 2007, 05:48 AM Wrote:interesting...  I went from royal purple (forget the weight) to mobile one my last oil change because I could not find my usual RP,  I bought a 20L pale for last years' season ... Ive found my car to be noisey'r on the whole and lose breath after a "few laps" I'm going back to the RP once I find another supplier for the 20L pale... which is a deal for $110 +tax.. and you get a nifty purple 20L pale after a year :D
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i'm taking a guess that you are using mobil 1 5w30 synthetic and RP 5w30 synthetic?

if that is the case i think the extra noise etc is caused by the fact that 5w30 mobil 1 is really thing and shears down to a 20 weight easily (at least in the wrx UOA i have seen this is indeed the case). the noise etc could be the result of basically running a thinner oil... maybe your knock sensor got confused by the extra noise and started yanking timing (thinking it was knock?)

i'm pretty anti the mobil 1 xxw30 products i think they are too thin