07/07/2026
If you drive a diesel truck, you already know DEF is part of the routine. But here’s the thing. Even drivers who top off regularly can end up running low without realizing it. DEF levels drop faster than most people expect, especially with heavy towing, long highway stretches, or stop and go city driving. A quarter tank can disappear before your next scheduled service, and running dry can trigger reduced power modes or leave you stranded.
The fix is simple. Check your DEF level every time you fuel up, not just when the dashboard light comes on. It takes thirty seconds and saves you from a much bigger headache down the road. If you’re not sure how to check it or top it off, bring your truck in and we’ll walk you through it.