the 3.6 in my cts is in fact a vvt.
Edvanp, for the noise under load, yes it can be noisy sometimes when around 2500-3000 rpm.
There's an improvment in the noise with PP but there is another noise that wasn't there with M1 (as I remember). Its like a little pinging like if I could here the pcv valve or something. I dont remember if I could hear it with Mobil 1. I'm at 50% on my Oil Life Monitor so maybe in a month or two, I'll switch back to M1 to see the difference again.
If you want to see some of my UOA, go in the UOA section and search for "cadillac cts".
I can say that the OLM is working differently with outside temperature because during the winter in Canada, the OLM call for an oil change at around 10k miles. Right now, in summer time, I'm almost at 7500 miles and I'm only at 50% remaining.