And I will say it again, could care less if I get flamed for it, RGT is buy far the best oil that I have used.....in the sense that you actually feel/hear that the oil is performing as advertised. Startup in morning -20-25 sounded like it had been started as if it was started already, no stress that you would normally hear and I usuallly hear in cold weather starts...such as belt whine etc. Best fuel mileage, and could not belive the quietness. Mind you I also use archoil 6oz. But I have for 3 years in every vehicle. And i have now ran three oci and if anything the performance of my Jeep has risen and drives day/night difference. I have switched oils many times always with archoil, so the variable is the same in that sense. And may have noticed a small difference here and there, but overall....this oil you literally know and feel that this product does what it says.