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Old 10-15-2015, 03:07 PM   #21
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Crusty White stuff. Yup It is essentially cow urine and water.
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Old 10-15-2015, 03:16 PM   #22
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Somewhere I read that when you add new to old it rejuvenates the old.


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Old 10-15-2015, 03:26 PM   #23
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Crusty White stuff. Yup It is essentially cow urine and water.
I wouldn't go that far, but it is made with urea. Synthesized, but still, yuk.
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Old 10-15-2015, 03:28 PM   #24
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Somewhere I read that when you add new to old it rejuvenates the old.


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As it was explained to me, thats like adding a quart of fresh gas to stale old gas and thinking it will get 'fresh' again.
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Old 10-15-2015, 03:50 PM   #25
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I carry 2.5 gal blue def in my 2011 chevy k3500 dually. I do t have a gauge or any way to tell how much is in the tank. It supposed to tell me on the dic when i have 1000 miles to empty, and to add 3.5 gal, but its been coming on at about 300. So it gets the 2.5 be ause i have warnings all over to never overfill the def tank. The trick in the winter is to not let it freeze.
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Old 10-15-2015, 03:54 PM   #26
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Every thing I've read about DEF says that there is no problem if it freezes. Freezing doesn't hurt the DEF in any way. Also, it is pretty much a given that the DEF in my tank will freeze over the winter unless my coach is stored indoors, which it isn't.
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Old 10-15-2015, 04:46 PM   #27
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As it was explained to me, thats like adding a quart of fresh gas to stale old gas and thinking it will get 'fresh' again.

True for gas which can turn to varnish DEF is mostly water as it was explained to me. Guess we need a chemist on the forum.


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Old 10-15-2015, 04:59 PM   #28
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Agreed. But whatever is in it, it degrades over time. Maybe I'll call a manufacturer and get it straight from the horse's mouth.
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Old 10-15-2015, 05:00 PM   #29
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But how do you know when it's full ???

My 2015 coachman Prism 2150LE has no gauge and my DEF tank and fill tubes are opaque. I don't want to run the risk of a 'blind' top-up and have the fluid come screaming up the fill tube then splashing the corrosive fluid all over the engine compartment.

Some say not to worry and just add fluid when low/empty warnings happen. Sure. Risking limited engine starts, 5 MPH maximum speed or even shut-down while giving unreliable and hard to access indication of DEF level is just plain stupid. Shame on you MBenz

I'm considering drilling a hole in my DEF tank and using some kind of 'dip-stick' to check the DEF level. Any ideas?
I have teh same problem. I keep the 2.5 Gal container in the coach. The MBS has a warning light /message telling you to add. I hear the 2016 MBS may have an actual gauge. So far 8,000 miles and no need to add DEF.
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Old 10-15-2015, 05:29 PM   #30
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Agreed. But whatever is in it, it degrades over time. Maybe I'll call a manufacturer and get it straight from the horse's mouth.

I don't think it's the mouth we have to worry about and it's not a horse lol.


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