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Old 09-23-2014, 10:22 PM   #15
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Originally Posted by Rburke8 View Post
Please note that you should use the same brand all the time. Even though they say there is no difference between one brand or the other the fact is they are different. My good friend use whatever he could get when he needed it and the next thing that happen was the sensors reacted and the GM truck did not run for sh*t. I always use Blue def and nothing else. Also the def has a shelve life. Buy it when you need it. Just plan appropriately. There was quite the discussion either here or the Excel forum about def that an engineer that works with the stuff wrote up some good info concerning def.
I thought it was all BLUE DEF? Any who I bought a bunch at Napa for $4.00 a gallon. Just have to keep an eye on the date code. Now my '11 2500 say's the warning will come on at 1K. That's BS. It came on my way to CO. and said 727 miles. Came on again and said 225 miles. CO trip was in 2013 225 mile trip was in July 2014 coming back from Truckee CA. DEF works. Sensors/warnings don't. I think as Duramax owners who's trucks require DEF fluid should pitch a bitch that there should be an up date from GM for those vehicles that do not come with something that tells us how much DEF we have.
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Old 01-11-2015, 12:22 AM   #16
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Do you really have to add that stuff to diesel fuel? will something happen to the engine if you don't?
DO NOT add DEF to your fuel tank! Yes something will happen if you do. DEF is 70% water and WILL cause fuel filter, possible injector problems.
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Old 05-09-2015, 11:20 PM   #17
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Do you really have to add that stuff to diesel fuel? will something happen to the engine if you don't?
No, you DON'T add it to the diesel fuel. Doing so would be disastrous.

You add it to the DEF tank, not the fuel tank.
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Old 05-26-2015, 08:32 AM   #18
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While in Canada I went into a NAPA store to get some Blue Def and the counter lady warned me not to put it in the fuel tank. I told her my fill neck was under the hood and asked her why she was warning me. She replied that the week before a Ford owner added it to his fuel tank because both fill necks were inside the fuel door and that he had only made it a block before his engine quit. He had to buy a new engine.....not a cheap mistake....
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Old 05-27-2015, 11:46 AM   #19
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While in Canada I went into a NAPA store to get some Blue Def and the counter lady warned me not to put it in the fuel tank. I told her my fill neck was under the hood and asked her why she was warning me. She replied that the week before a Ford owner added it to his fuel tank because both fill necks were inside the fuel door and that he had only made it a block before his engine quit. He had to buy a new engine.....not a cheap mistake....
You must own a Duramax. One of the reasons i bought a Ram and got rid of my Duramax is because the DEF fill on the Ram is next to the fuel fill.If one cant tell a blue cap from a green one they should be looking at the Prius
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Old 06-10-2015, 08:38 PM   #20
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I thought it was all BLUE DEF? Any who I bought a bunch at Napa for $4.00 a gallon. Just have to keep an eye on the date code. Now my '11 2500 say's the warning will come on at 1K. That's BS. It came on my way to CO. and said 727 miles. Came on again and said 225 miles. CO trip was in 2013 225 mile trip was in July 2014 coming back from Truckee CA. DEF works. Sensors/warnings don't. I think as Duramax owners who's trucks require DEF fluid should pitch a bitch that there should be an up date from GM for those vehicles that do not come with something that tells us how much DEF we have.
I am getting ready to buy a new Ram 2500, thank you for posting about the DEF. Approx, how often you need to add. I do not trust idiot lights any way.How much DEF does your truck hold?
Thank you.
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Old 06-11-2015, 09:57 AM   #21
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I am getting ready to buy a new Ram 2500, thank you for posting about the DEF. Approx, how often you need to add. I do not trust idiot lights any way.How much DEF does your truck hold?
Thank you.
The tank will hold about 5 Gal.The Ram you buy will have a DEF gauge under the tach. It depends on driving or towing as to how much you will use. Towing will us it up faster. My 2015 2500 used 2 gallons in about 1300 miles with about 700 of that towing.
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Old 06-11-2015, 10:05 AM   #22
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What is the difference between the $2.79/gallon DEF at Pilot/Flying J and the the $12/gallon DEF (about $30 for a 2 1/2 gallon container) at a GM dealer?
You answered your own question (red text)..

As others have stated, DEF is not a fuel additive. Diesels that require it have a special tank for storing it, in RV's usually located near the exhaust on the Passenger side. It reduces harmful emissions, and your nose can detect that it's working pretty well by the significant reduction in noxious odors coming out of the tailpipe.
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Old 06-11-2015, 11:20 PM   #23
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DEF will not last forever. As long as the ISO #22241 it is ok to use in any vehicle required to use DEF. Contact the manufacture 1st and ask about the date info. Most truck stops will have fresh DEF. Average cost (on sale) per gal. at the local parts store is $5.00
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Old 06-11-2015, 11:35 PM   #24
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Another brilliant EPA idea.
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Old 06-12-2015, 03:53 AM   #25
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Another brilliant EPA idea.

I was thinking it was because of CARB (Calif Air resources Board) I guess I won't blame it on Moonbeam.

I read a very interesting article about DEF in LandLine Magazine. If you listen to XM Radio Roaddog Channel they had quite the conversation about it.
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Old 06-12-2015, 11:12 PM   #26
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Another brilliant EPA idea.
Looking out for your grand/great children's health.You drive a diesel or are you just another complainer about everything?
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Old 06-12-2015, 11:50 PM   #27
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You must own a Duramax. One of the reasons i bought a Ram and got rid of my Duramax is because the DEF fill on the Ram is next to the fuel fill.If one cant tell a blue cap from a green one they should be looking at the Prius
Is there a cap, on both the DEF Tank and the Diesel Tank. I read an article in Hard Working Trucks
That posted pictures of the Ram Trucks not having a cap on either tank.
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Old 06-14-2015, 01:58 PM   #28
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The fuel inlet has a green plug in it. Cap would have been better. The DEF has a blue cap you must twist to get it loose it has a lanyard on it so it stays close by.
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