Join Date: Nov 2012
Location: So Cal
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The tanks hold 5 gal. And if you are towing it doesn't last as long as if you were driving lite. I towed a trailer (8000 pounds) from SoCal to Georgia When I left I filled the DEF, the message came on that I had 500 miles to go when I got to Georgia (2380 miles). I filled DEF again and when I got back to Socal (lite, not towing) it said I was under 1/2 but didn't show 500 miles to go. But I did refill it when I got back to SoCal and it did take 2 1/2 gal.
Some of the guys here that own new trucks say they refill theirs at every oil change (5000 miles), but they don't tow like I do.
Urea is urine, but if you google it you will se that it can be made in a lab, doesn't have to come from a animal.
Naturally, the chemical compound is not only produced by humans but also by many other mammals, as well as amphibians and some fish. Discovered in 1773 by the French chemist Hillaire Rouelle, urea became the first organic compound to be synthetically formulated. German chemist Friedrich Wöhler, one of the pioneers of organic chemistry, invented the process to create the synthetic version of the compound in 1828, just 55 years after its discovery.
Last edited by skipper h; 12-08-2012 at 09:55 PM.