STP® DEF makes replacing fluid easy with its fast filling, no-mess flow spout and hose delivery process.
Official Diesel Exhaust Fluid of Richard Petty Motorsports
STP® DEF is to be dispensed in a separate DEF tank on the vehicle, not the diesel fuel tank. To store leftover fluid, clean the tube and place in the box to avoid system contamination. Keep away from direct sunlight and store between -10°C (14°F) and 30°C (86°F).