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Old 10-15-2015, 01:03 PM   #11
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I keep a 2 1/2 gallon DEF in the most aft passenger side compartment. Each time that I get diesel, I fill it. Then when I get to my campground, I fill the DEF at my leisure. The container method also helps getting around the DEF tank being on the wrong side. Works for me.
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Old 10-15-2015, 01:17 PM   #12
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Excuse my ignorance. What is DEF?
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Old 10-15-2015, 01:18 PM   #13
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Guess my OCD might pay off. Most places that we spend a few days in involve a trip to the local Walmart for sodas, milk, etc, so if the light was down a bar I pick up DEF and add it before we pull out. It's about $9 for 2.5 gallons there (store brand). Call me paranoid. Good to know those guages can be off though. Thanks for posting that.
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Old 10-15-2015, 01:26 PM   #14
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Excuse my ignorance. What is DEF?

Diesel Exhaust Fluid. It is used by all of the newer Diesel engines for cleaner emissions.

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Old 10-15-2015, 01:30 PM   #15
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Cool

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Originally Posted by I-RV View Post
I keep a 2 1/2 gallon DEF in the most aft passenger side compartment. Each time that I get diesel, I fill it. Then when I get to my campground, I fill the DEF at my leisure. The container method also helps getting around the DEF tank being on the wrong side. Works for me.
Hank -
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?
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Old 10-15-2015, 01:30 PM   #16
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Thanks I would have never known that because I know nothing about diesels. I've always driven gas jobs.
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Old 10-15-2015, 01:44 PM   #17
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DEF

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Diesel Exhaust Fluid. It is used by all of the newer Diesel engines for cleaner emissions. Jason
Except VW...
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Old 10-15-2015, 02:14 PM   #18
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My truck goes 5000 miles on 1 def tank so that my number for my oil changes and refill tank.
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Old 10-15-2015, 02:25 PM   #19
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DEF MBS

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Originally Posted by Dennise View Post
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?
Our 2012 Solera uses about one gallon every 2000 miles. After oil change service, when the dealer should fill the DEF, I monitor mileage. After 3000 miles I add one gallon, then one gallon every 2000 miles until the next scheduled maintenance. Avoids both DEF warning lights and spills from overfill. I carry two single gallon jugs of DEF and a hose adaptor for the jugs with me.
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Old 10-15-2015, 03:01 PM   #20
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Be careful,,,, DEF has a shelf life of about two years. If you keep topping your tank off you'll have old fluid in there. There's even a 'born on' date on the containers so youll know how fresh it is.
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