Javi's Rules for DEF Usage..
Junior User
Joined: Nov 2014
Posts: 72
Likes: 4
From: Rock Hill, SC
Wowza, you all pretty much killed that discussion! This is a forum for opinions and experience, we should be more considerate of each other's opinions and experiences. I've learned a lot of from others on this forum. Glad I don't use the rat pee aka DEF anymore.
Fleet Mechanic
Joined: Jan 2016
Posts: 1,804
Likes: 113
I guess mine will be going into limp mode soon. I don't buy def at WalMart or any others. I fill up at a local truck stop and after every third tank or so I fill the def tank too. Price for def around here in the pump is right at $2.50 per gallon vs $5.00 per gallon at WalMart. I never check to see if it's under half tank or not. I just fill it.
FTE Legend
Joined: Mar 2017
Posts: 31,795
Likes: 9,122
From: Western NY
But all in all, most dudes are cool here. You're always going to have some bad apples. Just like in life.
Laughing Gas
Joined: Oct 2014
Posts: 962
Likes: 114
From: Middle TN
Obviously you haven't read the owner's manual. Go to page 21 and continue reading on. There's even a chart that will tell you when to leave it alone, and when to refill:
http://www.fordservicecontent.com/Fo...US_02_2014.pdf
I've seen quite a few fleets and individuals try the same thing you suggest, only to see their trucks in for service with a full DEF tank and in limp mode with miles to empty at zero. Ask about their maintenance, and some top their DEF off as often as every fuel fill up.
http://www.fordservicecontent.com/Fo...US_02_2014.pdf
I've seen quite a few fleets and individuals try the same thing you suggest, only to see their trucks in for service with a full DEF tank and in limp mode with miles to empty at zero. Ask about their maintenance, and some top their DEF off as often as every fuel fill up.
6.7 Weight Loss
Joined: Jun 2017
Posts: 1,141
Likes: 5
From: Woodbury CT
As I've always expected - this has got to be one of the most ridiculous systems any manufacturer has ever put in a vehicle. For crying out loud, the technology to measure fluid in a tank has been around for 200 years. It's the trying to build a better mousetrap syndrome deal - why. Don't get me wrong, thanks for the explanation, really appreciate it and as others have mentioned, makes sense now. I always fill mine when I get the 200 mile warning. But for the life of me, I just don't get why all the electronics? Put a freaken cork on a rod, measure the level and show that level on a gauge in the dash.
I'm thinking folks that fill theirs all the time don't experience a problem because they are always filling it. If that 1st or second electrode ever was exposed the truck would freak out and start messing with the warning messages.
I'm thinking folks that fill theirs all the time don't experience a problem because they are always filling it. If that 1st or second electrode ever was exposed the truck would freak out and start messing with the warning messages.
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