DEF Diesel Exhaust fluid fill near disaster BEWARE

[Flyer 516NG]

Originally Posted by Winterbagoal

Hard to believe you could return something that was opened, but it happens?
That is very good info for anyone using the DEF in a jug.

Yeah, I bought a set of used spark plug wires once. Didn't know it till I got home with them.

[BluRock]

Originally Posted by iluvuk

The jugs of DEF at Walmart have a sealed plastic film under the cap like antifreeze. You must remove it to pour. It tears when removed. Hard to miss unless you don't know. I think the jugs are safe if sealed

I did in fact purchase DEF from Walmart that had been opened. Wasn't sure if DEF was replaced with water so I returned and got another jug. I now make it habit to remove the cap to be certain the seal hasn't been broken.

[bharrisv65]

Originally Posted by BluRock

I did in fact purchase DEF from Walmart that had been opened. Wasn't sure if DEF was replaced with water so I returned and got another jug. I now make it habit to remove the cap to be certain the seal hasn't been broken.

I do that as well but you also have to be careful that some kook didn't re-glue the seal, I know this may seem far-fetched but these days you can't trust anything. I usually make sure the seal is "sealed" all the way around and looks "factory fresh". I bought this reasonably priced tester from Amazon: https://www.amazon.com/Thexton-THE10...s%2C166&sr=8-7

I filled a jug with DEF from a truck stop pump and tested it, the tester registered exactly as it should for good DEF. I also used the tester on plain water (since I was going to rinse it out anyway) and the reading was "bad". I think this will at least help and give peace of mind should you buy any "box" brand DEF.

[DC21]

Actually its fairly easy to remove the seal and put it back on without anyone knowing the difference. I wont say how here but its real simple. This is why I always use the tester, its the only way to be sure.