M2TS

By Christopher Moore | Moore 2 the Story | October 8, 2026

On October 5, President Donald Trump visited Grand Island, Nebraska, and signed an executive order intended to temporarily ease federal restrictions on using red-dyed diesel in highway vehicles.

As a diesel mechanic, that caught my attention.

Not because red diesel is new. It’s been around longer than some of the technicians working on the equipment that burns it.

I’m interested in what happens after somebody takes that announcement, drives down to the local fuel supplier, and fills their $90,000 pickup with cherry-flavored diesel.

Because the government can change the rules about what goes into your fuel tank. It cannot change the laws of physics. And it doesn’t approve your warranty claims.

So I started digging.

First, What the Hell Is Red Diesel?

Red diesel is diesel fuel containing a dye used primarily to identify fuel sold under different tax rules. It’s commonly used in agricultural equipment, construction machinery, generators, and other off-road applications.

It’s not an octane booster, a performance additive, or some mysterious chemical developed in a secret laboratory underneath a John Deere dealership.

Modern highway and nonroad diesel generally share the same ultra-low sulfur requirement of 15 parts per million. But the color tells you something about tax treatment, not everything about fuel quality.

Sulfur content, lubricity, cetane rating, biodiesel concentration, water, and particulate contamination all matter. Especially in modern high-pressure common-rail systems, where repairs can cost more than a respectable used Honda Civic.

A clean batch of red-dyed ULSD meeting the manufacturer’s fuel specifications doesn’t suddenly become mechanically unsuitable because somebody added food coloring’s industrial cousin. But being red doesn’t guarantee it meets those specifications either.

The Executive Order: What Did It Actually Do?

The federal diesel excise tax is 24.4 cents per gallon. That’s $8.78 on 36 gallons or $61 on 250 gallons.

But the executive order discusses deferring federal excise taxes. Not necessarily forgiving them. Those words are not interchangeable.

It directs Treasury to determine what relief it can legally provide, addresses certain dyed-diesel penalties, and calls for exploring whether deferred liabilities can ultimately be eliminated. That is more complicated than declaring all diesel tax-free.

Nebraska’s separate emergency relief is tied to qualifying agricultural transportation. A farmer hauling grain and someone taking an F-250 to buy groceries may face different state tax consequences, even with the same truck and fuel.

Which makes perfect sense. If you’ve never dealt with tax law.

And this is Nebraska in October. Case IH builds its Axial-Flow combines right here in Grand Island, so the connection between harvest, diesel, and local jobs isn’t exactly theoretical. Harvest doesn’t wait for a policy memo. Farmers are putting in long days, combines are moving, and trucks are hauling grain as fast as the fields give it up. That’s why fuel costs and agricultural transportation relief are more than an abstract debate around here.

Now, Let’s Talk About Your Truck

Modern diesel fuel systems are impressive pieces of engineering. They’re also spectacularly expensive when something goes wrong.

Whether you drive a Ford Power Stroke, GM Duramax, Ram Cummins, or a commercial truck running Detroit, PACCAR, Volvo, Mack, or Cummins, fuel quality matters.

Water, abrasive particles, improper fuel, and poor lubricity can cause real damage. But what about the dye itself?

So far, I haven’t found convincing evidence that the prescribed red tax-identification dye causes damage to modern diesel fuel systems at its prescribed concentration. That isn’t proof of universal harmlessness. It’s a reason not to blame an injector failure on color without evidence.

I’ve spent too many years watching people replace perfectly good parts because somebody confused a suspicion with a diagnosis.

Your Warranty Doesn’t Come With a Presidential Seal

Say you’ve got a newer F-350, Silverado 3500, or Ram 2500 under factory warranty. You fill up with red diesel. A few weeks later, the high-pressure pump decides it’s had enough of this world and takes the injectors along for the ride.

Ford, GM, and Ram all specify acceptable fuel and address damage from contaminated or improper fuel in warranty terms. For example, Ram’s 2026 heavy-duty warranty booklet details fuel-system coverage and exclusions. What we haven’t established is whether they will treat otherwise compliant dyed ULSD differently solely because of its color.

Using dyed fuel doesn’t automatically void your entire vehicle warranty. But an executive order doesn’t rewrite your manufacturer’s fuel specifications either.

And Donald Trump isn’t the guy processing your warranty claim.

Personally, I’d rather have the manufacturer’s position in writing before finding out which interpretation its warranty department prefers.

What About Actual Mechanical Damage?

My concern doesn’t end with the fuel system inside your truck. Mechanics use primers, transfer pumps, extraction equipment, hoses, fittings, and diagnostic tools that contact diesel fuel. Those tools aren’t cheap either.

Solvent Red 164, the dye associated with federal tax identification, is formulated to dissolve in diesel. I haven’t established whether specific dye formulations or carrier solvents have measurable long-term effects on seals and service equipment. That question remains open.

What we do know is that contaminated fuel can damage equipment, and a transfer pump can carry contamination from one tank to another.

Red fuel and dirty fuel aren’t synonyms.

Water, dirt, and neglected filtration don’t care whether the fuel was meant for a tractor or a Peterbilt. Neither does your injection pump.

There’s Also the Small Matter of January 1

The federal order identifies December 31 as the end of the temporary relief period. Nebraska’s agricultural relief expires December 23.

Different dates. Different rules. Same red dye.

That dye doesn’t disappear from your tank at midnight. Nebraska has acknowledged residual dye and says drivers aren’t required to flush tanks when its relief period ends. But questions remain about federal enforcement, other states, and what documentation to keep.

Ordinary federal penalties for unlawful dyed-diesel use can be the greater of $1,000 or $10 per gallon. Suddenly that $8.78 in potential pickup tax savings doesn’t look quite as exciting.

So, Should You Run Cherry-Flavored Diesel?

Here’s where I stand as of October 8.

If your truck is still under warranty, I’d wait.

Not because I’ve concluded red diesel will hurt it. I haven’t. I’d wait because we don’t yet have the manufacturer-specific clarification we’re looking for, and federal implementation guidance is pending.

If you’re out of warranty, clean dyed ULSD meeting the appropriate fuel specifications doesn’t currently give me a reason to expect damage simply because it’s red. But that doesn’t automatically make its highway use legal or prove that a particular bulk tank contains compliant fuel.

Being out of warranty doesn’t mean you’re out of reach of the IRS.

We’re Not Finished Investigating

The Treasury Department has an October 10 deadline under the executive order. That’s our next checkpoint for federal guidance, not a guarantee every issue will be settled.

I’m also examining manufacturer fuel requirements, warranty exclusions, dye chemistry, and potential effects on fuel-system components and service equipment.

If the evidence shows the fuel is mechanically equivalent, I’ll report that. If we find a legitimate risk, I’ll report that too.

I’m a diesel mechanic. My job is to figure out what’s actually wrong, not replace parts until something works. I approach reporting much the same way.

For now, my advice is simple: Wait for the remaining answers before changing what you put in your truck. Especially if you’re still under warranty.

Your truck. Your money. Your decision.

I’m just trying to make sure you have the information before somebody hands you a repair estimate with more digits than you expected.

Because there’s Moore to the Story.

Reporting note: This investigation remains open as of October 8, 2026. Federal implementation guidance and manufacturer-specific answers are pending.

Featured photograph: Case IH AFX 8010 combine, by existentist / Wikimedia Commons, CC BY 2.0. Illustrative photo, not represented as taken in Grand Island.