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Old 02-07-2011, 02:15 PM   #1
JEM
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Location: Beesleys Point, NJ 08223
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DEF (diesel exhaust fluid)

I am leaving for Flordia next week and I wanted to top off my DEF tank, indicator showed aout 3/4 fill (3 green lights). I had a great deal of trouble trying to pour the DEF from the 2 1/2 gallon bottle into the on board DEF tank, area was too small to get the container position to allow alll th fluid to empty into the tank. End up with about 1/4 gallon remaining and I put that in a smaller container and used a funnel to empty into tank.

Bad tank location and poor design. Anyone have any quicker/easier method????

Jim
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Old 02-07-2011, 02:46 PM   #2
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I removed the 2 gas pistons from the DEF cargo door. It allows the door to swing much higher and provides better access to the tank. I'm able to dump the 2.5 gallon containers directly in with the supplied nozzle.
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Old 02-07-2011, 02:59 PM   #3
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Thanks for the help!
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Old 02-07-2011, 08:44 PM   #4
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I guess the urea injection system that the Feds have made mandatory has killed any interest I may have had in diesel rigs. Can you pee in the tank or is urea nothing like urine?
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Old 02-07-2011, 09:14 PM   #5
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It's really no big deal. I've put about 4000 miles on my rig and added DEF twice. Probably could have done it once since both times I had plenty DEF left. I was just topping off the tank.
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Old 02-10-2011, 12:27 PM   #6
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I look at it like this..

- It helps make the air a little cleaner
- It helps the unit get a little better mileage
- it does need to be refilled, but only runs about $11 for 2 1/2 gallon jug

Not a big problem..
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Old 03-19-2011, 09:49 AM   #7
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Try to buy DEF at the pump.
Here is the website of a directory and services listing.

Search - discover Diesel Exhaust Fluid
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Old 09-19-2011, 09:26 AM   #8
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I just reached 7000 miles and the DEF warning light went on. Normal or not ?

The Mercedes dealer said I have to go there cause they have to reset something after they fill the DEF tank. True or not ?

If I refill before the light comes on again, I will probably save a lot of money ! Cost me $172 today. Learning is not cheap.
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Old 09-19-2011, 10:09 AM   #9
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if there is something to reset and they won't show or tell u, i would consider buying a service manual for that vehicle. it may also be covered in the owners manual.
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Old 09-19-2011, 01:09 PM   #10
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Wow. 14.3 gallons of DEF took me on a couple small trips here in Colorado and from here to Orlando and back. It was about 5k miles total. It was about $3.25/gal at the pump. I suspect as the rig gets older, it will require more DEF.
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