In 2010, the EPA changed the emissions standards for three-quarter and one-ton trucks to make them more stringent. Because of this, truck manufacturers were forced to start coming up with new ways to reduce emissions without compromising the power of their vehicles. Nearly all manufacturers turned to a selective catalytic reduction (SCR) system to comply with the regulations, most of which use diesel exhaust fluid as a key component. Luckily, diesel exhaust fluid suppliers can be found just about anywhere from truck stops to retail chains like Walmart, so it’s readily available wherever you’re out on the road.