How many miles does DEF last before you need a refill?
If you're curious about how many miles does DEF last in your truck, the short answer is normally somewhere in between 3, 000 plus 5, 000 miles, but that number isn't set in rock. It might be a lot easier if this were like a regular oil switch where you just hit a specific mileage and exchange it out, yet Diesel Exhaust Liquid (DEF) is the bit more temperamental. It's tied straight to how much gas you're burning, meaning your driving practices have a large say in how often you're unscrewing that little glowing blue cap. ...