Originally Posted by DonB2
19 Discovery. How much def fluid does the tank hold? Cant find it anywhere.
On our 2018 44H, the DEF tank is right behind the tag axel on the drivers side and is 13 gallon according to our owners Manual.
Pick up a $9 jug of DEF from Walmart and carry it as a spare if you’re afraid of running out.
I just stop and add DEF when the dash gauge indicates 1 Bar remaining. I never let it get below 1/4 Tank that way.