At 12k the oil looked fine, now worries. I have done 10k oil changes on the GTP since it was new, I've only changed it 17 times in 7 years I did a short change with convintional Mobil at 5k, M1 went in at 10k. I had to change the intake gaskets (upper supercharger and lower intake due to Dexcool) and pulled the front valve cover for grins at 140k and the engine was spotless inside, lifter valley and valve springs spotless. I have cut the oil filters open on that car and felt bad about not useing it again. The OLM on the GTP usually reads 0 at 6.5-7k miles. That car hauls butt, still makes me smile. I have never done a oil anyalsis, never added any make up oil I guess we got a good one. The HHR has a cartridge filter so it's easy to see and at 12k the filter was not bad at all. I've used the OLM on that car since new with M1. I brought this car home and changed the oil with 25 miles on it. I’ve never added any make up oil in this car either it now has 56k on it. I'm a many year user of M1, die hard one might say, it's never done me wrong, so bash it if you want.