TECH DEF EXHAUST FLUID

DEF is a solution of urea and water that's injected into the exhaust stream of vehicles to turn NOx gases (harmful emissions) into nitrogen and water. This system is called a Selective Catalytic Reduction (SCR) implemented by vehicle manufacturers to meet EPA emissions standards in 2010. This is a way of meeting the standards without compromising engine performance or fuel efficiency. DEF is not a fuel additive and is stored in separate tanks.DEF is a requirement for medium- and heavy-duty vehicles with engines produced after 2010. The vehicle is programmed to inject the DEF into the exhaust stream to meet emissions requirements. If the vehicle is allowed to run out of DEF, the engine performance will be reduced, and lower speeds are imposed.DEF can be purchased in several ways. There are varying sizes of jugs/containers a driver can purchase. This requires the driver to transfer the DEF into the vehicle manually. DEF can also be dispensed into the vehicle through a fueling dispenser when equipped.