There is a forum dedicated (pretty much) to oil-
http://theoildrop.server101.com/cgi/ultimatebb.cgi?
There is a lot of debate on that forum about OCI and different oil. Many agree a 5k mile or more OCI is perfectly fine, especially when using synthetics. I am still under warranty, so I'm sticking to 3k, but I switched back to dino oil, because using Mobil 1 on a 3k mile OCI was just wasting my money.