Thank you this post I was wondering the same thing. Actually one of my dads friends that lives in Tomball is running the FS2500. He swears by it. He said it was an initial shock buying it, but he said that after his first 30,000 mile oil change he was sold on the whole thing. Also look at Amzoil. I read something about trucks running this oil and changing only the filter and adding 1qt of oil. They are running 100,000 miles before draining the oil pan and putting fresh oil it the engine. Just some info I picked up. I am hoping nexted month to be running the FS2500 in my truck.