Off Road Diesel: What Red Diesel Is and Who Can Use It

Published Oct 23, 2026 · 5 min read · By Hassan, Owner of Roadmate Services

Diesel comes in two colours, and only one of them belongs on the highway. Off road diesel is regular diesel dyed red and sold without road fuel tax, for equipment that does not drive on public roads. Putting it in a car or pickup you drive on the road can cost you a penalty of at least $1,000 under federal law, and Ohio has its own penalty on top.

Quick answer: off road diesel at a glance

Sources: 26 U.S.C. 6715, Ohio Revised Code 5735.124, EPA diesel fuel standards. This is general information, not legal or tax advice.

What is red diesel?

Red diesel is the same diesel sold at a truck stop, with a dye added to show that no road tax was paid on it. The IRS Publication 510 rules require dyed diesel to contain the red dye Solvent Red 164 at a set strength. The dye does not make the fuel better or worse. It just makes it obvious.

Think of it as road diesel wearing a tax-exempt costume. If you searched “red diesel” from the UK, note that this page covers US and Ohio rules; the UK has its own.

Off road diesel vs regular diesel

• Colour: red for off road diesel, undyed for road diesel.
• Tax: road diesel carries federal tax of 24.4 cents a gallon (IRS) plus state fuel tax. Off road diesel does not, when it goes to an allowed use.
• Sulfur: the same. Highway diesel had to be ultra-low sulfur (15 ppm) by 2010, and all nonroad diesel by 2014, according to the EPA.
• Where you can use it: off public roads only.

Your engine cannot tell the two apart. The tax office can.

Who can use off road diesel?

Dyed diesel is meant for uses that are exempt from road fuel tax. Common examples are tractors and other farm equipment, bulldozers and excavators, generators, and other machinery that works off the road. The exact list of nontaxable uses is in IRS Publication 510; check it, or ask your fuel supplier, before you buy for a business.

A personal car or pickup driven on public roads is not on that list, even if it spends weekends on a trail. A tractor, on the other hand, does not care what colour its breakfast is.

Can you put off road diesel in your truck?

Not if the truck is driven on public roads. Inspectors check by drawing a small sample from the fuel tank. Red shows straight away, and traces stay visible even after you top up with clear diesel, so a tank does not “wash out” in one fill.

• Federal: using dyed fuel for a taxable use carries a penalty of the greater of $1,000 or $10 per gallon of dyed fuel involved, and the $1,000 grows with each earlier penalty (26 U.S.C. 6715).
• Ohio: using dyed diesel in a motor vehicle on public roads carries a penalty of the greater of $1,000 or $10 per gallon of the vehicle’s fuel tank capacity, multiplied by the number of earlier penalties (Ohio Revised Code 5735.124).

Note the Ohio rule counts the size of the tank, not how much red fuel is in it.

The 2026 federal relief, and why it does not settle it in Ohio

On October 14, 2026, the IRS said it will not impose federal penalties when dyed diesel is sold for or used on highways, from October 1 to December 31, 2026 (IRS news release IR-2026-122). The IRS says this applies for federal tax purposes only and does not change state taxes or penalties.

As of late October 2026, Ohio was not among the states that announced their own dyed-diesel relief, and Ohio’s penalty is a separate state law. Before you put red diesel in a road vehicle in Ohio, check with the Ohio Department of Taxation. After December 31, 2026, the federal penalty applies again unless the IRS extends the relief.

Will red diesel hurt a diesel engine?

Current dyed diesel will not. It is the same ultra-low sulfur fuel your truck already burns. The risk is old stored fuel: off road diesel only had to be ultra-low sulfur from 2014, and higher-sulfur fuel is hard on the exhaust systems of diesels built since about 2007.

Water and age in a farm tank cause more trouble than colour does. Fuel that has sat in a barn since 2013 is not vintage. It is just old. Diesel exhaust fluid is a separate thing again; see what DEF is for diesel.

Out of diesel on the road in Columbus?

Get safe, then call. On I-70, I-71 or I-270, get as far onto the shoulder as you can with hazards on. If you cannot get well clear of traffic, stay in the vehicle with your seat belt on. More in what to do if you run out of fuel.

Not every fuel is a roadside job, and we will say so. We bring clear, taxed road diesel, not dyed fuel, because a vehicle on the road needs road fuel. For cars and pickups we usually bring 2 gallons, or as much as you ask for; fuel delivery is an estimated $60 to $110 + fuel cost in Columbus. For semi trucks we bring up to 20 gallons, quoted by phone. Bulk fuel for a farm or a job site is a fuel distributor’s job, not ours.

We work 6 AM to 8 PM daily, Eastern Time, and arrive in about 32 minutes on average, depending on traffic, weather and location. How it works, and why a diesel that ran dry may not restart, is in our diesel fuel delivery guide.

Frequently asked questions

More fuel guides: is driving on empty bad; premium vs regular gas; E10, E15 and ethanol-free gas.

The bottom line

Off road diesel is ordinary diesel, dyed red and sold without road tax, for farm, construction and other off-road use. In a vehicle driven on public roads it risks a federal penalty and, in Ohio, a separate state penalty based on tank size. The federal pause ends December 31, 2026, and does not cover Ohio law. If you are out of diesel on the road, the answer is clear road diesel.

Keep the red for the tractor and the clear stuff for the commute.