2017 GMC/Chevy DEF tank!

Me Again wrote:

Thermoguy wrote:




I've never had to fill mine up while on the road. I only fill it when I get an oil change. I agree it's not in a great place, but I like that it is hard to spill DEF on my paint.

You must not tow much! I add 2.5 box in the 1600 mile trip between Washington and Arizona.

That sounds like you are going through too much IMO. My truck was filled when I bought it. I used 4 gallons in 9000kms. I added about 3 gallons at that point. Still haven't had to add any and I have put on 3500kms since then.