Fleet Maintenance & Management

Cold mornings stop more diesels with gelled fuel and iced filters than with dead batteries. A pre-freeze checklist for diesel fuel, water separators, DEF and a pre-winter scan, built on fuel chemist and OEM guidance.

EPA’s Texas diesel fuel waiver allows 500 ppm sulfur diesel through October 24 for pre-2007 trucks and Tier 1 to 3 equipment only. Here is how fleets on Texas lanes can protect DPF and SCR systems.

The EPA 2027 NOx limit starts Jan 1, but the warranty, useful life, and DEF derate changes EPA proposed in July aren’t final. Here’s what fleets and diesel shops need to know.

The October 5 executive order waives federal dyed-fuel penalties for highway use through December 31, 2026 and defers the federal diesel excise tax. What fleets need to know about the deferral, state rules, and the catches.

If you’ve recently gotten an email suggesting you’re about to lose support—and that the “only” solution is switching diagnostic brands—take a breath. You’re not the only shop being put in that position, and you’re not stuck. At DEFY DIAGNOSTICS, we’re keeping this...

When it comes to R-1234yf air-conditioning service machines, both TEXA Konfort 760 Touch and Robinair AC1234-9 Connected stand out as premium contenders. But for technicians who work on mixed fleets, EV/hybrid systems, and diagnostic-driven workflows, the question...

What if your team could trigger a forced DPF regen from 500 miles away, and get the truck back on route before lunch? Fleets and off-highway operations live and die by uptime. A truck stuck in derate, a loader throwing intermittent DTCs, or a combine with a clogged...

You know that smell. The one in a used work truck that smells like old coffee, cigarettes, and “something leaked in here six months ago.” Or the lingering funk in a loaner car after one messy customer. Detailers fight it. Fleet managers hate it. And passengers always...

New Free Resource: Downloadable Wiring Diagrams Now Available on DefyDiagnostics.com At Defy Diagnostics, we know how frustrating it can be when you’re chasing down an electrical fault, and you don’t have the right diagram in front of you. Whether you’re...

If you service both R-134a and R-1234yf, every minute your AC machine spends “switching over” quietly drains profit. Multiply that by dozen, or hundreds of jobs per year, and it’s a budget line you can’t ignore. Dual-gas machines promise convenience, but not all...