Hello. Question!
Posting Guru
Joined: Jun 2014
Posts: 959
Likes: 10
From: Medford, OR
Trending Topics
Posting Guru
Joined: Jun 2014
Posts: 959
Likes: 10
From: Medford, OR
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Laughing Gas
Joined: Oct 2017
Posts: 787
Likes: 72
From: Lansing MI
As with most things. When it's time. And since the light is on, its time.
Most refill the tank when they change the oil. As was said above, about 1000 miles per gallon on the DEF, so 7.5 gallons is 7500 miles.
Most refill the tank when they change the oil. As was said above, about 1000 miles per gallon on the DEF, so 7.5 gallons is 7500 miles.
Senior User
Joined: Apr 2018
Posts: 168
Likes: 2
A more ideal situation would be to not let it get below a quarter of a tank, to prevent it from sucking in debris that may be in the tank or taking the truck into “limp” mode.
DEF is used constantly by the pickup, it is an expendable item. Need to refill it, just watch the gauge
DEF is used constantly by the pickup, it is an expendable item. Need to refill it, just watch the gauge
Elder User
Joined: Jan 2004
Posts: 566
Likes: 3
From: Florence SC