Hello all, I have been lurking on bitog for several years now, and figured I should finally join. As for a little about myself, I have been a mechanic at a GM dealership for 2 years now while I am finishing up my college degree. Until I stumbled on this forum I didn't even know what a UOA or VOA was. I currently have 2 vehicles, a 96 Grand Cherokee and a 07 Supercharged Cobalt SS. My oil and filter of choice for the Jeep is Rotella T5 10W-30 and Mopar filter. As for the Cobalt, I use Mobil 1 5W-30 and AcDelco filter. My oci for the Cobalt is 3k miles, it might be a little overkill, but I run the car really hard when I drive it (and I do race it), it's not stock (smaller pulley, bigger injectors, exhaust) and I feel it is cheap insurance. The Jeep gets a 5k mile oci. However, my mother has a 2008 Pathfinder and has done 7.5k mile oci since new with Mobil 1 and switched to Mobil 1 HM at 100k, she's now at 290k miles. Seeing her track record makes me reconsider my oci whenever I start commuting to the city.