I try to add to this board based on my 45 years of work and 35 years as a repair shop owner, that being said I realize that there are many coolants, oil, fluids and additives that are far better that OE. I recommend OE while the vehicle is under warranty and usually continue with the same recommendation even after warranty is over, the OE's for better or worse have spent millions developing specific fluids for better service life. I know that GM was tired of paying warranty claims due to fluid failures that claimed to meet GM's specs but in reality did not, that is what brought us Dexos. I now have been told that GM is developing a GM certified oil filter as they are again paying out claims on runied engines due to a orange plastic/rubber compound that is stuck in the screens on VVT engines, it appears the some of the low cost oil filters are causing this problem. I lost a court case on a ruined engine due to not using the OE's recommeded oil, I was using a major brand that claimed to meet the OE's specs but it did not, the judge stated the I was the professional and should have known better, the oil company in question held firm in their claim the their oil was ok to use, but refused to support me on an appeal. I also have another shop owner who used a universal asian transmission fluid from a different major oil company on a drain and refill, the transmission died, the car was under warranty, the fluid was tested and again, warranty denied, oil company stood by their claims and as in my case our insurance company would not pay the claims because we used the "wrong oil". I am just trying to add what the professional shops must go through, we have to walk a very tight rope to stay ahead, usually the judges are clueless and the oil companies will make certain claims that they will refuse to back up when help is needed. I went to a class on oils put on by a indpendent instructor not related to any oil company and the biggest thing I took away was that if the statement on the bottle states the word "meets" it usually means that it met the specs before testing, but failed the test, on the other hand if it uses the word 'exceeds" it passed the OE's required testing specs. I counted the oil and transmission fluids that we stock the other day and found that we now carry 37 different types, amazing! I hope this sheds some light on my positions and why I say what I say.