First DEF fillup

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Jul 30, 2017 | 09:27 PM

hwheeler

Thread Starter

Mountain Pass

Joined: Sep 2008

Posts: 216

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First DEF fillup

I reached 9250 miles and the "500 miles to Def empty" message came up. I filled the DEF tank and it took 6.9 gallons. That means I'm getting close to 10,000 miles per Def tank. That seems good to me

Jul 30, 2017 | 09:34 PM

A&Pmech

Senior User

Joined: Apr 2017

Posts: 399

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That seems really good to me too. I'm st 3200 miles and half full on def and I rarely tow. So I'm thinking I'll be looking at 6000-7000 miles per tank of def.

Jul 30, 2017 | 09:34 PM

jwc410

Mountain Pass

Joined: Jan 2010

Posts: 144

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From: West Newton, PA

I added 5 gallon at 4500 miles and the gauge showed full when I bought the truck

Jul 30, 2017 | 09:45 PM

BowtieConvert

Lead Driver

Joined: Jan 2017

Posts: 6,841

Likes: 4,132

From: Jacksonville

Do you tow much? That will affect the DEF consumption. I have mine topped off at every oil change (5k) and last time it took over 6 gallons. That was with quite a bit of towing.

Jul 30, 2017 | 10:16 PM

hwheeler

Thread Starter

Mountain Pass

Joined: Sep 2008

Posts: 216

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I didn't tow much. Maybe five hundred miles but it was a heavy 16000 lbs fifth wheel. I'm very surprised that I went that far. I wonder if it drops off with age. I know they increased tank size but that's still better than my 2014 F350.

Jul 31, 2017 | 07:32 AM

kry226

Fleet Mechanic

Joined: Dec 2016

Posts: 1,818

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From: Florida

If it were me, like the OP, I wouldn't fill up the DEF tank until it was low and called for refilling. It seems to me that this is the best way to ensure the freshest DEF and quality consistency. YMMV.

Jul 31, 2017 | 09:55 AM

Nick77584

Junior User

Joined: Jun 2017

Posts: 78

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Quote:

Originally Posted by kry226

I follow this logic as well. The foreman at the Ford dealership told me that the nature of DEF is to begin to gel as it ages. Said only fill up 5 gallons at a time when prompted by the low warning light.

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Jul 31, 2017 | 03:55 PM

tpalmer007

Senior User

Joined: Sep 2016

Posts: 117

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I just filled up DEF for the first time at 4,000 miles at Pilot. No towing but heavy pedal and it took 6.1 gallons. I'd say the OP is doing great with the DEF usage.