Originally Posted by paullovern
We took our 2013 AI in for its 20K mileage service. Our MB dealer said that as part of the service, they needed to refill the DEF tank. I mentioned that I had just topped it off after our lat road trip. He told me that they need to use their computer to inform the onboard computer that the tank was full and that they would flush the tank and refill it. Has anyone any experience with this?
Flush and refill is part of the standard 20k service, according to the Sprinter maintenance manual. I am still about 3400 miles shy of needing the 20k service, but I just had my Airstream at the Sprinter dealer for warranty work last month, and asked them about the service so I'd know what to expect.
Flush and fill is
different from just fill. It's supposed to remove any accumulated contaminants that may have built up in the system. Or so they said. Probably a good idea to have it done.
a good idea to waste all of the DEF you just put in, either; they can't reuse it by draining it, filtering it, and putting the same DEF back in. Don't ask me why, but my Sprinter dealer says they can't.
If my Interstate needs DEF before it needs the 20k service, I'll have the 20k service done early so that I don't waste DEF. On the other hand, if I need the 20k service before I need the DEF, I'll delay the 20k service until I need DEF. As long as I don't get a message along the lines of "You have xx starts remaining until your Schedule B service" in which case I won't have a choice.
And one other thing… The DEF they sell at Walmart meets the same ISO standard as the stuff Mercedes sells, so when I do take it in, I'm going to buy a couple of jugs of the stuff at Walmart and take it along, and tell them, "Here. Use this." No reason to let Mercedes charge me $32 per gallon when I can buy exactly the same stuff without the brand name for $12 per 2½-gallon jug.