So I sent my wife to pick up some oil and a filter while she was out doing some shopping. I asked her to get M1 5w-30, but she mistakenly picked up M15w-30 EP instead. The oil has the Starburst, and meets GM6094M. So there should be no problem as far as my warranty is concerned. I don't plan on doing an extended OCI with this oil. Will probably change it out between 7-8k. I just wanted to make sure it's ok to use...though I don't see why it wouldn't be. Never hurts to ask though. It's going in an '09 Silverado 5.3. Thanks!