I'm looking at a Jeep with a Mercedes-Benz OM642 motor in it and it requires DEF, does a gallon last a good long while in a passenger vehicle? My state doesn't have an emissions check, could I get away with using demineralized water in a jam? I read if it's runs empty it goes into limp mode.
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DEF aka Diesel Exhaust Fluid
- Thread starter Drago
- Start date
- Staff
- #2
From what I have read they have the def tanks large enough to last between oil changes.(When it is time to change the oil, time to fill the def tank.)
Yes, most will go into a form of limp mode when the tank gets empty. But, they give you plenty of warnings and time to fill it.
I remember reading an article of people putting tap water in it, this was on a dodge 3500+.
Yes, most will go into a form of limp mode when the tank gets empty. But, they give you plenty of warnings and time to fill it.
I remember reading an article of people putting tap water in it, this was on a dodge 3500+.
Mad Maxx
See, what had happened was...
What Y/M/M Jeep? If it's one of the 07-08 Grand Cherokee's, those don't use DEF, they only have a DPF.
- Staff
- #4
And a word of warning, they have a DEF quality sensor in them so you can't use just water in them. DEF isn't that expensive, is widely available now, and it is designed to last for a long time. So there isn't really a reason to cheap out on it and run water.
Mad Maxx
See, what had happened was...
Some Fuel Stations are starting to have DEF avail. at the Pump now too, so no more Buying Jugs, if you come across one of those Stations.
3500GMC
What T F, over
Diesel Particulate Filter. Some call it a 'cat' short for catalytic converter.. Or ash tray, you name it. It's that thingy upstream in the exhaust that supposedly makes the trees smile and get greener as you drive by. Lol
- Staff
- #9
I thought Jeeps used the VM Motori diesel? I would use what is supposed to be in there. Use DEF only. You can get it at Walmart and most of the refueling stations now. Some stations even have a DEF pump outside for it now.
- Staff
- #10
Make sure it actually needs DEF, not many vehicles started using it until around 2010 or so.
Mad Maxx
See, what had happened was...
If it's an '07 is does NOT use DEF.
DPF is just another Soot Trap along with the Cat. Look into Tuning so you can get it Deleted and get your MPG back that you're gonna Lose when it goes into Re-gen Mode to Burn Off all the Soot.
TS Performance makes a Tuner Box for it too.
