This all reminds me of a talk once given by a Volvo Trucks design engineer in Gothenburg on one of my factory visits around 2004, a very clever Swede who made an amusing point.
Adblue is a 'Urea' solution, generally harmless apart from being corrosive to steel (Adblue tanks are usually plastic) and he claimed it closely resembled pig's and probably human's urine in chemical make-up!
As a Volvo SCR truck engine is designed to lose some power when the Adblue runs out, his suggestion was that if a driver suffers this fate before getting to a refill point, he could simply p*ss in the adblue tank to get back to full power to drive home!
Quite how a car driver would do this with an adblue tank under the car, I can't imagine, but might be a useful tip if you're ever caught out or caught short!
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