I had the oil changed and I have been checking around the area for Diesel emission fluid and found that it is expensive. Decided to check around a bit more and the truck stop card lock that is open to the public had the fluid for $2.89 a gallon from a gas station style pump. So you know the whole thing is pay for a plastic 2.5 gallon jug that you have to dispose of or go to a truck stop and pump it in the tank. No disposal problems with the plastic jug and the amount of DEF the card lock pumps the fluid is fresh.