diesel is about to become trouble for you;

DEF is the acronym for Diesel Exhaust Fluid. Every diesel truck that has been made since 2010 is required to use it. It's a product made of 32.5% urea (made from natural gas) and 37.5% de-ionized water. DEF is kept in a separate tank in the truck and the trucks using it will not start unless the DEF system is working properly. There are regulators inside the engine that mix DEF with the diesel exhaust to reduce diesel emissions. That's the purpose of DEF..........more.........