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Old 03-24-2023, 08:46 AM   #1
Chief Brown
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DEF at truck stops

I was in a local Ram dealership recently and the subject of DEF came up. I told the service manager that I buy my DEF at the truck stops when I need some. He said oh don't do that. He said it is not the same quality as what you can buy elsewhere i.e., (Autozone, Walmart,etc). He said it would "crystalize" in my DEF tank and cause all kinds of issues.
Just wondering if anyone on here has had issues with DEF from truck stops?
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Old 03-24-2023, 08:56 AM   #2
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The quality is set by the federal government.
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Old 03-24-2023, 09:16 AM   #3
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Okay it’s regulated by Govt. Does anyone have answer to the first question here?
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Old 03-24-2023, 09:18 AM   #4
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I have never had a problem. I buy at truck stops because of shelf life. Rapid turnover at truck stops.
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Old 03-29-2023, 02:01 PM   #5
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I have never had a problem. I buy at truck stops because of shelf life. Rapid turnover at truck stops.
Same here. Never had a problem
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Old 03-24-2023, 09:23 AM   #6
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Good to know. Thanks
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Old 03-24-2023, 09:33 AM   #7
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I Buy at the truck stops most of the time. No problems.
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Old 03-24-2023, 09:33 AM   #8
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Great thanks
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Old 03-24-2023, 10:07 AM   #9
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I have never heard of anyone having had a problem with truck stop DEF. Or bottled for that matter.

But I can’t help but keep wondering. Tankers put new DEF on top of any old still in the underground tanks. And next time the same. And next time ….. The percentage new vs old would depend on the amount still in the tank. As such the old is still there on top of the old old, on top of the old old old, …. The old DEF can never be completely eliminated simply by adding new, just continuously diluted. Still, apparently it is not a problem. I am sure I am just over thinking it. My little engineer brain does that often.
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Old 03-29-2023, 01:17 PM   #10
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I have never heard of anyone having had a problem with truck stop DEF. Or bottled for that matter.

But I can’t help but keep wondering. Tankers put new DEF on top of any old still in the underground tanks. And next time the same. And next time ….. The percentage new vs old would depend on the amount still in the tank. As such the old is still there on top of the old old, on top of the old old old, …. The old DEF can never be completely eliminated simply by adding new, just continuously diluted. Still, apparently it is not a problem. I am sure I am just over thinking it. My little engineer brain does that often.
As I understand it, this is what you're supposed to do with pizza crust. A small amount of one batch is carried forward to the next, in perpetuity.

Obviously this is for smaller scale pizza processing. Also, I may be completely talking out of my behind here.
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Old 03-24-2023, 11:44 AM   #11
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I have done both truck stop def and a variety of def from Autozone, etc. If I can find it, I usually get the ultra premium blue def, because I notice a substantial increase in fuel economy and power, but I've never had an issue with any of it from the pump.
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Old 03-24-2023, 11:55 AM   #12
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I've been running truck stop DEF for close to a year now without issue. I dont believe it is a problem. I would think if would be fresher than store bought, because its always turned over with new DEF.
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Old 03-24-2023, 12:30 PM   #13
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If I can find it, I usually get the ultra premium blue def, because I notice a substantial increase in fuel economy and power,

I guess that happens a lot.
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Old 03-24-2023, 12:37 PM   #14
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DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
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Old 03-24-2023, 02:03 PM   #15
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DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
Agree. The supposed “premium” DEFs claim to reduce or eliminate DEF crystallizing and build up in the exhaust system. But the only place I have ever seen any claims of that being a problem is in the advertisements of the manufacturers that sell a “premium” grade DEF. And even if true, that would happen over time, not between tankfuls of DEF (according to those manufacturers).
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Old 03-24-2023, 08:28 PM   #16
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Originally Posted by rohrmann View Post
DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.

2X !!!!!!
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Old 03-25-2023, 08:04 AM   #17
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If the DEF at the truck stops was “ bad “ then there would be trucks sitting on the side of the road everywhere. That’s the only place trucks get their DEF. I don’t get mine there because of price,but I would have no problem if need be. If the truck stops were only fueling a couple of trucks a day then I would worry about the DEF. But at a busy one then there’s going to be a constant turn over. They are getting several loads of fuel a day,and probably a tanker load of DEF at least once a week.
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Old 03-29-2023, 02:35 PM   #18
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All fuels and def take their suction from the bottom of the tank. Each liquid has it’s own specific gravity, so it’s not layering like oil and water when new fuel/def is delivered. Tanks also have agitators to alleviate separation. Now, a small percentage of what you get “could” be day one fluid due to mixing. I wouldn’t be too concerned. Stuff that’s on the shelf has a higher probability of getting old. Typically it’s cheaper at the pump as well. I would go for that…
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Old 03-29-2023, 07:25 PM   #19
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DEF is DEF and a bazillion trucker can't be wrong...
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Old 03-29-2023, 03:11 PM   #20
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DEF

Quote:
Originally Posted by rohrmann View Post
DEF will have no impact on power or fuel mileage because it is injected into the exhaust stream just ahead of the catalytic converter, not into the engine. It works with the converter to reduce oxides of nitrogen in the exhaust.
Not trying to be a S.A., but since that is the case, why can't I just use something like ammonia water (?) in the DEF tank ? I will continue to buy DEF at the truck stops - never had an issue - but just wondering .

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