I have used valvoline over 40 years in a variety of vehicles. 100 % success with up to 6000 miles between changes. Almost zero oil consumption! I decided to try mobile one syn. in my ram hemi at 7500 miles. Now at 8500 miles its down a half a quart and quite dirty. Guess i,m going back to what i have always trusted. Has anyone else experienced this? This hemi did not use a drop of oil before the switch.