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Old 07-25-2015, 03:39 PM   #61
Join Date: Jul 2015
Location: iowa
Posts: 98
New to these forums,but I am a gm tech. DEF is injected into a chamber by the drive shaft. Not sure how that would ever harm the engine. Have not bought any from a truck stop for my duramax but wouldn't be afraid to.

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Old 07-26-2015, 07:52 AM   #62
Join Date: Jul 2014
Location: New Hampshire
Posts: 88
The first nine months I owned my truck I only used Walmart DEF. Then 1 year ago the truck stop near my home put in a DEF pump at the diesel island. It may be my imagination or perhaps new truck break in period but I think I am getting better mileage out of the truck stop stuff vs Walmart.

For what it's worth...
2014 Ram 3500 diesel SB Crew cab
2014 Silverback 31RK

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Old 07-26-2015, 06:54 PM   #63
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Join Date: Nov 2013
Location: Kirtland, OH
Posts: 309
It is your imagination, DEF is DEF. It only effects emissions. It's quality is regulated like gasoline. You want to get DEF at the best price so you can do more camping.
William & Sara
2012 Silverado 2500 HD DA
2014 Cedar Creek 38CK
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Old 07-27-2015, 09:24 PM   #64
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Join Date: May 2015
Posts: 141
i buy it from the pumps so far no problems, its also cheaper than buying it from the store at least in my home town

2014 cedar creek 36ckts
2014 Chevy 3500 1 ton crew cab 4x4 long bed.

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