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Old 09-21-2013, 11:21 PM   #1
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How much DEF fluid does your coach use?

Just bought a new 2013 Fleetwood Excursion. Never needed def fluid on the old cat I had in my Winnebago. How much do you use and whats the cheapest way to get it ?? Some places state you will use a gallon every 2-300 miles!! Could get expensive rather quickly
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Old 09-22-2013, 01:43 AM   #2
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DEF

Diesel Exhaust Fluid (DEF) is an emissions control liquid required by modern diesel engines. It is injected into the exhaust stream. DEF is never added to diesel fuel. It is a non-hazardous solution of 32.5% urea in 67.5% de-ionized water. DEF is clear and colorless, and looks exactly like water. It has a slight smell of ammonia, similar to some home cleaning agents. DEF is used in by Selective Catalytic Reduction (SCR) technology to remove harmful NOx emissions from diesel engines.

DEF is stored in a tank on board the vehicle, and injected into the exhaust stream by a metering system at a rate of 2% of diesel consumption volume (46% within Europe). This low dosing rate ensures long fluid refill intervals and minimises the tank's obtrusion into vehicle packaging space. An electronic control unit adjusts the addition of fluid in accordance with such parameters as engine operating temperature and speed.
Diesel exhaust fluid is offered to consumers through a variety of quantities by manufacturers ranging from containers of it for single or repeated small usage, up to bulk carriers for consumers that require a large amount of DEF. It is recommended that DEF be stored in a cool, dry, and well-ventilated area that is out of direct sunlight.

Purchase Sources:
2.5 gal @ Walmart $11.97
Pilot Flying J claims to have the cheapest DEF prices
Cummins Dealers Diesel Exhaust Fluid (DEF)
Usage Calculator: Fleetguard Diesel Exhaust Fluid (DEF) Usage Calculator
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Old 09-22-2013, 04:40 AM   #3
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Old 09-22-2013, 04:46 AM   #4
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Many Truck stops have a DEF nozzle at the pump. The clue is if they have a sign that says "Bulk DEF". First time I saw that sign at anew truck stop was before I knew about DEF and I wondered why they were advertising bulk defroster fluid for $2.79.
So the pump is least expensive but might not be most convenient. Unfortunately the modern DEF pumps have a magnetic lock that makes it difficult to put DEF into a portable container. The DEF tank in your MH has a magnet that keeps the nozzle flowing. The purpose of that magnetic lock is to prevent putting DEF in diesel fuel tanks.

So bulk DEF at the pump is least expensive while WalMart is the least expensive for getting it in boxes.
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Old 09-22-2013, 07:57 AM   #5
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As was previously stated, you should be using 2 gals of DEF for every 100 gals of diesel. Typical price is 2.79 at Flying J. So add $5.60 to your approximate $400 diesel bill, and you will have the total.
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Old 09-22-2013, 08:17 AM   #6
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cat

Does later models of Cat use this? If so what year did they start? I just got a 07 and never heard about it?
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Old 09-22-2013, 08:19 AM   #7
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I disagree with the 2gls. DEF per 100 miles. I've driven at least 500 miles and used 1/4 of a DEF tank, tank being 10 gl., and @ the 2 gl. per 100 miles I should have used a full tank. The amount of DEF used is directly related to how much Idle time, and slow/city driving you do. The DEF is used in the Re-Gen cycle of the system to burn out the soot that's built up in the exhaust filter - the more idle the more soot, the more highway driving the less soot - less soot lest Re-Gen.
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Old 09-22-2013, 09:20 AM   #8
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With just over 19k miles on the odometer we've been averaging just UNDER 2% DEF to fuel. I'll need to dump a 2.5 gallon container of DEF in at somewhere between 1000 to 1200 miles. That gives me a 4 t 5k range on our 10 gallon DEF tank. I use an assumption of 7mpg for trip planning. Using the lower 4000 mile range on a 10 gallon tank, that comes to a 1.7% usage rate. That would be about $2200 in fuel, $48 for DEF if buying it at Walmart or about $30 if buying it in bulk at the truck stop.

Interestingly, if calculated in money spent, $48 is about 2% of $2200.
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Old 09-22-2013, 09:23 AM   #9
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D Lindy I do believe you misread Cbones statement. "2 gals per 100 gal of diesel fuel" so that would equate to apprx 1 gal per 400-500 miles. Which is about correct for my 2013. I have used apprx 1/4 of a tank (10 gal) in 1500 miles.
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Old 09-22-2013, 09:30 AM   #10
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One gallon to every 500 miles is what we average on the Cummins 450ISL. I buy it when on sale at Advanced Auto Parts, 2.5 gallons $9.95.
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Old 09-22-2013, 09:54 AM   #11
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Mine uses approx., 1 gal per 1000 miles . I have a 380 HP Cummins in a 40ft Winnebago. I can buy it at the pump at many truck stops for $2.79 per gallon or pay $11.79 (Approx) at Wal Mart for a 2 1/2 gallon container. The problem at the truck stop is the pump is usually on the left side of the coach and the MH's tank is on the right side. This will require a turn around (usually against traffic) or you can do it like I do. I purchased two 5 gal gas cans. I fill them at the pump and store in the MH basement until they are needed.
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Old 09-22-2013, 11:45 AM   #12
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We use 2- 2 1/2 gal per 1000 miles. This is over 12,000 miles, so far.

450 ISL pushing 44,000 lbs

We have a station near the stick and brick that sells it for $9.99 a jug. Other wise Walmart or Sam's.
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Old 09-22-2013, 01:59 PM   #13
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I keep hearing about the magnetic pump block at bulk refuelers, but I've never seen any. We always fill our containers at bulk pumps. Much cheaper. We have six 2 1/2 gal containers that I've found at truck stops and Wal Mart parking lots that we refill and carry when we go for long trips (Alaska, Arizona). I also carried three 5 gal containers for insurance. In just over 23,000 we've put in 57 gal. That's pushing a 42,000 coach and pulling 6,000 worth of toad.
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Old 09-22-2013, 02:11 PM   #14
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Quote:
Originally Posted by Pigman1 View Post
I keep hearing about the magnetic pump block at bulk refuelers, but I've never seen any. We always fill our containers at bulk pumps. Much cheaper. We have six 2 1/2 gal containers that I've found at truck stops and Wal Mart parking lots that we refill and carry when we go for long trips (Alaska, Arizona). I also carried three 5 gal containers for insurance. In just over 23,000 we've put in 57 gal. That's pushing a 42,000 coach and pulling 6,000 worth of toad.
I have not found a truck stop that does not have the magnetic pump block but I have been limited to SC and GA so far.
Any way to tell just by a quick whether or not they have the lock?
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