I was doing a OC on my wifes 2011 Equinox 4 cyl. It calls for 5/30 wt Dexos oil. I thought the jug I bought was the right stuff, but I mistook the nascar logo for the dexos logo and put the oil in. I don't expect anything bad will happen, but wanted to find out what Dexos exactly is and what that "special" oil does, in the motor. All I could find on line was that it has to be a full synthetic or part synthetic blend.The oil I used had a sl, sm,& sn, api rating on the bottle. People on line say if you don't use Dexos oil it will void your warranty. Well that ship has sailed, and I 've read that alot of people are having high oil consumption issues once the 4 cyl motors get up to 50k on them. Blaming the rings. That tells me, the factory recommended oil isn't working. So besides being what the factory want's Chevy owners to use, whats so special about the Dexos rating?.,,,