What is the 2015 ford f350 def tank capacity?

The capacity of the 2015 Ford F-350's diesel exhaust fluid (DEF) tank is about 5 gallons. It's recommended that when filling, You use a filler spout from Ford; this will prevent overfilling or spilling, as it will stop at the capacity. When You receive the "low DEF" warning on Your dashboard, it typically means that You have two gallons or less of DEF remaining in the tank. More specifically, the inboard frame mounted reductant tank holdS5.2 gallons, while the outboard frame mounted reductant tank holdS5.73 gallons. The gauge inside is limited, so it'll only give You an accurate read out when You are low. Essentially, if You're above half full on the 5+ gallons, that's about all You'll know; detailed information isn't available until under half.