Posted: Nov 16 2010 at 6:03am | IP Logged

I use ONLY Mobil 1 in my engines.  That should be fine and in fact, excellent.  I was warning about using an older non-SM oil like an SL or an SJ, for example, that have high levels of zinc. However, if you have bad rings or some other mechanical issue that allows oil to get into the exhaust, you can slowly poison the cats.

Go to bobistheoilguy.com and start reading on the forums.  You'll learn a lot about oil there.  As a retired organic chemist, I have to say it is a pretty good site.

Did you check out Courtesy Nissan on the Web?