DPF Guys Blog
INDUSTRY News, Updates, AND Tips from the DPF Guys
No, DEF Isn’t Going Away. Neither Are DPFs.
Here's what is actually happening.If you've spent any time on social media lately, you've probably seen headlines claiming the EPA is "getting rid of DEF" or "ending emissions systems on diesel trucks." Those claims make for great clickbait, but they aren't true. The...
EPA 2027 Diesel Engine Requirements: 7 Changes Fleets Need to Prepare For
EPA 2027 diesel engine requirements will sharply reduce allowable nitrogen oxide emissions from new heavy duty engines while expanding the range of operating conditions under which those engines must remain compliant. For fleets, the result should be the cleanest...
Profit to Pollute: What the Diesel Delete Pardon Story Leaves Out
The federal government has pardoned diesel mechanics and companies, stopped pursuing certain criminal emissions cases, and expanded access to emissions repair information. None of those actions turned permanent emissions defeat into lawful repair. That distinction...
Did the EPA Eliminate DEF Derates and Legalize Diesel Deletes?
No. As of July 21, 2026, the Environmental Protection Agency has proposed replacing federally required SCR compliance derates and vehicle speed restrictions with visible and audible warnings on newly manufactured diesel engines, vehicles, and equipment. The proposal...
Trucking’s Cost Per Mile Just Hit $2.336.
Here's Where the Extra Money Is Actually Going.It cost $2.336 to run a truck one mile in 2025. That's the highest number the American Transportation Research Institute has ever recorded in its annual cost study, up 3.4% from the year before. Strip out fuel and the...
Your Truck Is Already Broke. You Just Don’t Know It Yet.
Why Every Mile Should Pay for the Next One, and How to Calculate the Right Maintenance Reserve for How You Truck Most owner-operators think truck repairs begin the day something breaks. A turbocharger fails. A transmission starts slipping. The engine derates. The DPF...
The 2015 Freightliner One Box SCR Problem No One Explained
Why Detroit one box systems throw SCR Efficiency Low and NOx Conversion Efficiency warnings under load, even though the truck runs fine on flat ground.The truck is doing exactly what it has always done. It rolls steady on the interstate. Empty or lightly loaded, it...
Best Truck Repair Apps and Directories: What Drivers, Fleets, and Shops Should Actually Use
Nobody stuck on the shoulder of I-285 with a derated truck wants to download twenty apps and compare them. Nobody running a repair shop wants to pay for ten directory listings hoping one is the right call. Maybe one is. Maybe none are. And nobody who has chased the...
“DOT Doesn’t Care About Emissions”?
Inside Modern CVSA Inspections, Exhaust Checks, and the Myth of the "Perfect Delete"Spend enough time on any trucking forum, diesel Facebook group, or YouTube comment section and you will find some version of the same claim: "DOT doesn't care about emissions." It...
The Supreme Court Just Changed Trucking Forever
The Industry Is Talking About Crashes. We Need to Talk About the Smoke.On May 14, 2026, the U.S. Supreme Court ruled 9-0 in Montgomery v. Caribe Transport II, LLC that freight brokers can be held liable for hiring unsafe carriers. Every justice agreed. The U.S....
How Much Pollution Does a Deleted Diesel Truck Produce?
How much pollution does a deleted diesel truck produce? We broke it down using EPA-based data and compared diesel soot to burning tires using real numbers. No hype. No guesswork.What You See vs What’s Actually Happening Most people have seen it. A diesel truck rolls...
AI in Trucking: Why the Industry Needs to Learn From Amazon’s Costly Mistakes Before It’s Too Late
Amazon is one of the most sophisticated technology companies on the planet. It runs warehouses, data centers, and logistics networks at a scale most businesses can't imagine. And in early 2026, it learned a painful lesson about what happens when you hand too much...
Diesel Emissions Myths That Could Cost You Thousands: Setting the Record Straight
Two stories are spreading fast through the diesel truck community right now. You have probably heard at least one of them. Maybe both.The first goes something like this: Trump and the EPA wiped out diesel emissions laws. Deletes are legal now. Do whatever you want....
A Parked Regen Is Not a Fix. It’s Your Truck Asking for Help.
There is a debate that runs on a loop in the diesel truck community. It goes like this: emissions systems are the problem. Road calls are proof. If the technology worked, trucks wouldn't be breaking down every few hundred miles.It is an understandable argument. If you...
The Delete Crowd Won’t Tell You This. Your Wallet Will.
The stories below are composite experiences drawn from real conversations in the diesel industry. Names and details are changed. The mechanical failures and dollar amounts are not.Spend five minutes in any diesel truck forum or Facebook group and you will find them....