Originally Posted By: jorton
Originally Posted By: mrKiKaZ
Hey guys,
Thanks for all the informative information. Here's a little more info about my car.
It is supercharged and has 130k, mainly from lots of freeway driving daily with occasional spirited drives in the canyons and track days . I replaced the pcv valve like someone suggested yesterday, but the old one still seems good (never ever replaced).
Up to 115k miles my car would use no more then 1qt for 5000 mile oci.
Since 115k I've started to use just below 2qts for 5000 mile oci.
My owners manual says max oil consumption can be up to 1.1qt for every 600 miles. That seems really excessive! My cars never had to use near that much.
So far it sounds like 5w40 would be fine to run in my car but not the best choice. I suppose I should stay in the xW-30 oils, definitely going to try out high mileage.
While I'm not a fan of Mobil 1, they seem to be the only brand that offers a high mileage in full synthetic as I would like to stay with full synthetic oil even though I've read great things about valvoline maxlife. Seeing that I live in Socal, I'm probably going to try 10w30 high mileage.
Regarding use of rotella 5w40, I've emailed shell and was informed not to use it because my car still has catalytic converters in exhaust system.
I also had a UOA done fairly recently when I was using Castro edge, now I'm using Pennzoil ultra, still the same oil consumption with both BTW.
http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1902754
Very useful info.
Rotella 5w40 is SM rated no worries about your cats, shell is doing a cya.