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Old 08-27-2014, 10:36 PM   #1
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DEF question

I see that lots of folks complain about the need to put DEF in their vehicles. Why ? What is it I am not understanding about it ? It does not seem to be expensive , and I don't believe you have to add it often .
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Old 08-27-2014, 11:05 PM   #2
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DEF is about 12$ for 2.5 gal at Wallmart or most auto stores. I use 1 gal every 1000 miles not towing and 1 gal in 500 towing. Truck holds 5.5 gal. It's a non issue with me. My tailpipe is still clean inside. I put out cleaner air than China sends us.
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Old 08-28-2014, 09:05 AM   #3
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I think what most people complain about the DEF is the fill location. On many coaches the fill is located on the passenger side. Unfortunately, pumps at truck stops only have the pumps on the driver side and the hose will not reach the passenger side. I and many others carry containers and fill these at the truck stops. When we get to our locations we transfer from the containers to the coach. DEF at truck stops runs between $2.69 - $2.79 per gallon. It would be so much easier if the manufacturers placed the fill on the driver side.
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Old 08-29-2014, 01:49 PM   #4
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DEF is not much of an issue. DPF and/or EGR are.
They add significant cost to buy and maintain, reduce efficiency and increase engine wear as well as exhaust gas temps.

With DEF, you may still have an EGR. Read about the effects on cylinders as soot is sucked back into the engine. Might as well throw out the air filter (not really).
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Old 08-29-2014, 01:59 PM   #5
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Personally, I think people like to complain about anything that appears like "government oversight" and/or an "infringement on how it used to be."

I agree that the DEF fill location is on the wrong side of my coach, and that's annoying. But I love that my DP exhaust doesn't stink!! And I like knowing that I am being a little gentler on Monther Nature too. :-)
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Old 08-29-2014, 07:08 PM   #6
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Quote:
Originally Posted by Statgeek View Post
Personally, I think people like to complain about anything that appears like "government oversight" and/or an "infringement on how it used to be."

I agree that the DEF fill location is on the wrong side of my coach, and that's annoying. But I love that my DP exhaust doesn't stink!! And I like knowing that I am being a little gentler on Monther Nature too. :-)
+1

And my DEF is easy to reach.
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Old 08-29-2014, 09:09 PM   #7
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That's why you buy a Ram. The DEF filler is right next to the fuel filler. DEF is here to stay.
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Old 08-30-2014, 06:00 AM   #8
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DEF filler necks by the diesel fuel filler neck scares me. How many times have you caught yourself thinking about something else at a fuel pump, and almost pumping gasoline into your diesel tank?

The penalty for putting DEF into the diesel tank will be complete replacement of every part in your fuel system, and it's a $12K cab off job. And some insurance companies are picking up the tab.

I just think the DEF filler needs to be completely away from the diesel filler--and it is on some trucks.
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Old 08-30-2014, 12:39 PM   #9
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Really?? If you put DEF in the fuel tank even though they are next to each other, they do look different, well, you need to re-think your ownership of a diesel. Under the hood there are several things to fill wrong. If the DEF filler is under the hood you might put DEF in the brakes, radiator, windshield washer. If your kid or wife does it for you, all bets are off.
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Old 08-31-2014, 07:54 AM   #10
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Quote:
Originally Posted by Statgeek View Post
Personally, I think people like to complain about anything that appears like "government oversight" and/or an "infringement on how it used to be."

I agree that the DEF fill location is on the wrong side of my coach, and that's annoying. But I love that my DP exhaust doesn't stink!! And I like knowing that I am being a little gentler on Monther Nature too. :-)
My position on the politics of it is not quite that strong, but even on my 13 year old gas car, the VAST majority of repair costs and all Check Engine Lights have been a function of emissions system issues. Cost to own over ten years would have been thousands less.

I like to preserve the environment and don't want to stink anything up with my diesel either, but it all comes at a significant price to you, the owner. Specifically, any Tier 4 emssions will add 5-10% to the purchase price, add hundreds of pounds of weight, reduce fuel economy (how's that good for the environment?), and shorten engine life due to higher exhaust gas temps and introducing particulates to the intake cycle via an EGR. Not to mention the raw fuel that gets dumped into a DPF for regeneration, if you have one. The EPA looks the other way when that happens.
Add to all this the fact that a regular mechanic can't work on them anymore without some very expensive diagnostic equipment, and guess who ultimately pays for that... you and me.

It is a catch 22 because I like to promote diesels to my friends as a good option for their cars, trucks, and agricultural/lawn equipment. No one wants an "old", sticky vehicle.
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Old 08-31-2014, 01:16 PM   #11
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Originally Posted by Highway 4x4 View Post
Really?? If you put DEF in the fuel tank even though they are next to each other, they do look different, well, you need to re-think your ownership of a diesel.
Do owners that have accidentally pumped gas rather than diesel have to reconsider as well?


Quote:
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Under the hood there are several things to fill wrong. If the DEF filler is under the hood you might put DEF in the brakes, radiator, windshield washer. If your kid or wife does it for you, all bets are off.
True, but all of those mistakes combined will not equal the cost of replacing the entire fuel system, as required, if DEF is put into the fuel tank.

From another angle that most will never consider, NOT having the DEF filler next to the fuel filler is a plus in the aftermarket world. Existing service bodies, ambulance bodies, hauler beds, etc are not set up for the larger dual filler cutout in the body and may lack the space for two fill hoses. When I bought my new truck it was with the full intention of moving the utility body from the '03 to the new truck and I didn't even think about DEF filler location as part of the decision on brand or model. Fortunately it didn't become a problem.
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