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Redline

Redline

Likes to Drive and Ride
scootr29 said:
Yes....all diesel manufacturers in North America use SCR technology which requires DEF. International was the hold out until about a year ago and they recently switched to SCR and DEF using Cummins engines.
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Not exactly.

Last month we bought a new, 2013 VW TDI Jetta SportWagen. It does not use DEF.
 
H

haven

Expedition Leader
VW has used DEF in its heavier diesel vehicles (Passat, Touareg) for a couple of years. The Golf/Jetta changes to DEF in 2014. DEF is used in a process called selective catalytic reduction to control oxides of nitrogen. Previously NOx was controlled by exhaust gas recirculation. DEF allows EGR to be dialed back, making a better-running, more economical engine.

DEF is injected at a rate of 2% to 6%, compared to the diesel fuel. That explains why a 5 gallon tank of DEF can last for 10,000 miles (a common oil change interval in today's diesel passenger cars). If your diesel car gets 40 mpg, 10,000 miles of driving would require 250 gallons of fuel. 2% of 250 gallons = 5 gallons of DEF.

Depending on where you buy it, DEF doesn't have to add much to the operating expenses of the vehicle. My local Advantage Auto Parts store sells a 2.5 gallon container of Peak DEF for $12. A single gallon costs $8. At a truck stop where they purchase DEF in bulk, you can add DEF to your vehicle for about $3.00 a gallon.

Using the $8 a gallon price, 5 gallons of DEF would cost $40. If 5 gallons of DEF lasts 10,000 miles, that's about 4 cents per 10 miles driven.

Better watch out if you ask your auto dealer's service department to add DEF. There are reports of charges up to $32 a gallon for a DEF refill. And there is no difference between the fancy dealer branded DEF and the stuff sold at auto parts stores.
 
overlander

overlander

Expedition Leader
scootr29 said:
Real world diesel news...2008 Jeep Grand Cherokee CRD with GDE tune...you would never be able to pull these miles in a Jeep Grand Cherokee equipped with the gas engines....


Trip yesterday from SC to MI....I tracked 2 segments of the trip...both segments were 301 miles (GPS verified)....I was fully loaded with camping gear plus a car top carrier. Probably averaged about 70 mph..no traffic jams, weather etc. used cc and did not go over 2500 rpms.

1st segment: SC to Richmond, KY 301 miles divided by 12.5 gal = 24 mpg

2nd segment: Richmond, KY to Rossford, OH 301 miles divided by 12.7 gal = 23.7 mpg

Happy Happy Happy

450 miles in a 5500lb+ SUV, traveling 70 mph with lift, 32" tires, cargo top carrier is proof that we need diesels...

View attachment 173864
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What the Cherokee's transfer case high range ratio? I couldn't find any specs on high range. Is it 1:1?
 
SSF556

SSF556

SE Expedition Society
haven said:
VW has used DEF in its heavier diesel vehicles (Passat, Touareg) for a couple of years. The Golf/Jetta changes to DEF in 2014. DEF is used in a process called selective catalytic reduction to control oxides of nitrogen. Previously NOx was controlled by exhaust gas recirculation. DEF allows EGR to be dialed back, making a better-running, more economical engine.

DEF is injected at a rate of 2% to 6%, compared to the diesel fuel. That explains why a 5 gallon tank of DEF can last for 10,000 miles (a common oil change interval in today's diesel passenger cars). If your diesel car gets 40 mpg, 10,000 miles of driving would require 250 gallons of fuel. 2% of 250 gallons = 5 gallons of DEF.

Depending on where you buy it, DEF doesn't have to add much to the operating expenses of the vehicle. My local Advantage Auto Parts store sells a 2.5 gallon container of Peak DEF for $12. A single gallon costs $8. At a truck stop where they purchase DEF in bulk, you can add DEF to your vehicle for about $3.00 a gallon.

Using the $8 a gallon price, 5 gallons of DEF would cost $40. If 5 gallons of DEF lasts 10,000 miles, that's about 4 cents per 10 miles driven.

Better watch out if you ask your auto dealer's service department to add DEF. There are reports of charges up to $32 a gallon for a DEF refill. And there is no difference between the fancy dealer branded DEF and the stuff sold at auto parts stores.
Click to expand...

Yes buy your own DEF....just like you top off your windshield wiper tank, you can do the same with the DEF tank. DEF will also over time leave a white residue. This is the urea evaporating. It does have a shelf life so may be good to toss anything that has been sitting for longer than a year. When you fill up put the cap on and just flush the area with a small amount of water to wash away any DEF...and what ever you DO NOT put DEF in your diesel tank. It will corrode your injectors and you may be in for a huge repair bill. The dealer can test your diesel fuel and it will indicate DEF. DEF and SCR are here to stay and will be with all diesels for the near future.
 
K

kickingprop

Observer
Redline said:
Yep, I was aware of that. :)

I wanted a car that doesn't use DEF, but I'm sure the ones that do or will use DEF will be fine automobiles.
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I believe the new Mazda 6 skyactiv-D 2.2L turbo diesel will not use SCR technology. Something about lower NOx emissions due to the lower compression ratio. Don't quote me on that but I swear I remember reading that in a press release
 
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