DEF at truck stops

[rohrmann]

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.

[BB_TX]

Originally Posted by rohrmann

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).

[TenOC]

Originally Posted by rohrmann

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 !!!!!!

[Trevor]

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.

[pacbj]

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…

[Foldbak]

DEF is DEF and a bazillion trucker can't be wrong...

[MaxwellD]

Originally Posted by rohrmann

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 .

Max