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Old 10-15-2015, 02:07 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, 02:16 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, 02:26 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, 02:28 PM   #24
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Somewhere I read that when you add new to old it rejuvenates the old.


Wayne
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, 02:50 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, 02:54 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, 03:46 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, 03:59 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, 04:00 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, 04:29 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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Old 10-15-2015, 04:34 PM   #31
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I believe adding DEF, freshens the older amount in the tank. I put on 34,000 miles in 2 1/2 years which means that I am moving a lot of DEF. Others may have longer periods of standing still. DEF has been covered previously and storing at elevated temperatures, shortens its life. - Hank
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Old 10-15-2015, 04:55 PM   #32
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Anyone know the capacity of the tank on our Berks? I was able to put a total of about 8 gallons total in before it overflowed.

Also, I'm going to investigate a way of temporarily "cheating" (GASP) the sensor, in case I ever run out again. May not be possible, but if it is would be a great way to limp into a place to buy DEF.

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Old 10-15-2015, 05:08 PM   #33
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Boo,
The DEF tank on the Berkshire holds 13 gallons.
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Old 10-15-2015, 05:10 PM   #34
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Anyone know the capacity of the tank on our Berks? I was able to put a total of about 8 gallons total in before it overflowed.

Also, I'm going to investigate a way of temporarily "cheating" (GASP) the sensor, in case I ever run out again. May not be possible, but if it is would be a great way to limp into a place to buy DEF.

Boowho??


(def delete)

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Old 10-15-2015, 05:13 PM   #35
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Boo,
The DEF tank on the Berkshire holds 13 gallons.
I thought so.... something ain't kosher here. After the engine quit, I was only able to get 8 gallons in before it overflowed.

That means there was still 5 gallons in the tank, that was unavailable to the engine.

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Old 10-15-2015, 05:51 PM   #36
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something ain't kosher here.

That means there was still 5 gallons in the tank, that was unavailable to the engine.

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X2
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Old 10-15-2015, 07:18 PM   #37
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Sounds like a call to FL is in order.


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Old 10-15-2015, 07:43 PM   #38
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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?
DEF fluid isn't corrosive it's a clear liquid. It will leave a white residue that will wash of with plaln water. WONT HURT PAINT on your truck or RV if you are worried about skin contact wear rubber gloves I do all the time for the diesel fuel. On the RAM it's next to the fuel fill. DO NOT PUT IT IN YOUR FUEL TANK at least a 10k repair.
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Old 10-15-2015, 07:53 PM   #39
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(def delete)


Huh??

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Old 10-15-2015, 07:55 PM   #40
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Sounds like a call to FL is in order.


Wayne
YEP.

I missed the call, but the help line did call me for a status today.

Will talk to them tomorrow.

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