Geodoctor
Junior Member
Fairly new to the diesel truck world with a 2018 2500. I accidently poured 5 oz of "Lucas upper cylinder cleaner and injector cleaner" in the DEF tank (the correct amount for 30 gal diesel tank) Im so used to using the DEF port for "fluid that's not diesel". I just topped off the DEF tank 2 days ago till it was almost coming out the port so it is very full. It definitely holds more than 2.5 gal because i know there is more than that in it. I have not driven it but i will need to soon. I have 2.5 gal jug of DEF and 2 fresh gallons of distilled water on hand. i have no other vehicle to go buy anything else/no wife or kids or relatives nearby. Please help!