1st DEF Refill VIDEO
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Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
1st DEF Refill VIDEO
Ok, guys. I know this is pushing the limits of the mundane but here is a video on a DEF refill. To those who will find this retarded, I apologize...
YouTube - 1st DEF Refill 2011 Ford Super Duty
YouTube - 1st DEF Refill 2011 Ford Super Duty
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
I think it is pretty intelligent. If you keep driving it will count you down just like the Miles to E. I drove mine down to 340 or something like that and then filled with almost 5 gallons. 1/2 tank should be 2.5 gallons. I doubt we'll ever get it drained to where 5.5 or 6 gallons would be required. The engine will go into a reduced power state and eventually limp mode. It's in the manual.
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Postmaster
Joined: Apr 2009
Posts: 3,839
Likes: 2
While I agree that the countdown is intelligent, I have seen a post that says the dealers can actually see percentage left in the tank. If they can in fact see this, why not put it on the display?
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Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
Lol. I didn't have my spectrum analyzer handy so it just seemed like the thing to do at the time. Tasted like.... ammonia water. 
Posting Guru
Joined: Mar 2004
Posts: 1,307
Likes: 0
From: MARYLAND
I don't have the 6.7L yet..not till next July/Aug. With the DEF fill..how often do you have to fill based on used tanks of fuel? I know there is a computer that tells you your percentage. But I'm wondering how often/much it would be filled based on a fuel useage?
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Post Fiend
Joined: Apr 2004
Posts: 5,158
Likes: 35
From: North of Salt Lake City
This was my first refill in 5,500 miles. That works out to be just a little over a third of a cent per mile. It depends upon how hard you work your truck. Towing, for example creates high exhaust gas temps which is when the NOx is formed. The DEF is injected to break the NOx down into its inert components (Nitrogen and Oxygen). If you're towing a lot, you will refill more often. If you run around town on short trips, you'll hardly use any at all. I've heard refill ranges anywhere from 3,500 miles to 10,000 miles.
Posting Guru
Joined: Jun 2006
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Diesel engine manufacturers using DEF to meet 2010 emissions talk about a 2% rate of usage, so it should be roughly 2 gallons of def for every 100 gallons of diesel fuel used. Also little or none is used till engine gets up to temp so it should follow that the short trippers/light loads are going to use less.
