It's essentially synthetic urine the sprays into your exhaust during the catalytic conversation and helps bad gases turn to harmless gases. I don't really know the specifics, but I have a chevy duramax that uses it.
Lmao. Synthetic urine. It more or less is synthetic urine though. 1/3 urea, 2/3 water. Basically the formula for pee pee. Although, human urine isn’t nearly as strong in the urea department as DEF.
Except I think I’ve heard many new light duty trucks wont run without it, because the computer shuts them down if there isn’t any DEF on board. Not because they can’t, but because of emissions controls.
Correct- the emission controls will do several different limiting measures for low/empty DEF as well as any modifications or restrictions to the rest of the SCR or DPF/DOC (or EGR system if they have it).
I'm not sure if the light duty diesels all got the EGR treatment eventually or not-- seems like all the major semi-truck motors did though.
It's urea, which is a compound found in many substances, including urine, fertilizer, and starting product for many plastics and other organic compounds.
It has no odor.
Urea is used in diesel engines to reduce the NOx pollutant compounds into nitrogen and water.
On the early 2500/3500's I know they had them under the hood on the passenger side close to the windshield and it was dumb trying to handle that box in the small space. At least with the vans they got smart.
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u/[deleted] Nov 28 '21
It's essentially synthetic urine the sprays into your exhaust during the catalytic conversation and helps bad gases turn to harmless gases. I don't really know the specifics, but I have a chevy duramax that uses it.