Should I repair, overhaul or replace my truck?

Chapter 01

Is this truck still worth fixing, and how do I tell?

A truck is worth fixing while it earns more than it costs to keep running, over the time you plan to keep it. You can tell from records you already have. The repair history shows what the truck has cost you and whether the same failures keep coming back. Your books show what it earns on a working day. Put the two together, and you know what each day in the shop costs. Then you can compare every option on the same basis.

Here is how that looks. Say you run four trucks. Truck 3 is a 2017 tractor with 780,000 miles, and it is paid off. On Monday, September 14, 2026, your driver calls you from a shop. The engine is leaking oil and has lost power. The mechanic gives you two prices. He can fix today’s leak for $3,500 in two days. But he says the engine itself is worn out. It burns oil, and he expects more breakdowns like the ones truck 3 has had this year. His other price is an engine overhaul, where he rebuilds the engine inside the truck with new internal parts. That costs $28,000 and takes about three weeks, or 15 working days. That night you look at trucks for sale. A dealer has a 2022 tractor with 380,000 miles for $85,000.

Owners on trucking forums have asked this for years, often as “overhaul or buy another truck?” No federal rule decides it. We also found no official figure for what an overhaul, a used truck or a day off the road should cost. Figures from dealers, lenders and forums are not reliable enough to repeat. So every price on this page belongs to the example, and you use the quotes you get.

Industry numbers show why the question comes up more often now. ATRI, the trucking industry’s research institute, found that the average cost to run a truck in 2025 was $2.336 a mile. That is the highest in the report’s history. Repair and maintenance costs rose 8.6 percent in one year, and the average truck got older (ATRI’s 2026 cost report). Those are averages across many fleets. They are not your costs, and they cannot make this choice for you. Your own numbers can.

Start with truck 3’s repair history. You already have it. Federal rules make you keep a record for every truck you control for 30 days or more. It must show the “date and nature” of each inspection, repair and maintenance job (the maintenance rule). You must keep those records for 1 year, and for 6 months after a truck leaves your control. Keep the invoices longer if you can, because they are the truck’s whole story.

Pull the last 12 months, and put each repair you did not plan on its own line. Say truck 3 shows three. In February, a turbocharger: $4,200 and 4 days in the shop. In May, injectors: $3,800 and 3 days. In August, an oil cooler and a tow: $5,100 and 5 days. That is $13,100 and 12 working days, not counting oil changes and other planned service. And all three failures were in the engine. That pattern matters more than any one bill. When the same part or the same system fails again and again, that is a recurring failure, and it shows you where the money goes. Whether each bill was fair is a separate question, and our guide to checking a repair invoice covers it.

Next, take what truck 3 earns. Say your books show it brings in about $1,000 of freight on a working day. It works about 20 days a month, or 240 a year. The costs that stop when the truck stops (fuel, the driver’s mileage pay and tolls) take $600 of that. Its fixed costs (insurance, plates, parking and its share of your office) come to about $250 a working day. They keep running whether the truck moves or not. That leaves about $150 a day of profit. Our guide to cost per mile shows how to pull these numbers from your own books.

Now you can price a day in the shop. Most owners call this truck downtime. A parked day does not cost you the whole $1,000, because you also save the fuel and the mileage pay. It costs the $400 left after them. That is the $250 of fixed costs you still pay with nothing coming in, plus the $150 of profit you do not make. So for truck 3, every day in the shop costs about $400, and last year’s 12 days cost $4,800. There is a cost that is harder to count, too. A driver paid by the mile earns nothing while the truck sits, and a long stay can cost you the driver.

Put it together, and you see what truck 3 really earned last year. In a year with no breakdowns, $150 a day over 240 days is $36,000 of profit. The breakdowns took $13,100 in repairs and $4,800 in lost days. That is $17,900, about half the year’s profit. So here is the real question. What can the truck still earn over the years you plan to run it, and what will it cost to keep it running? A profit and loss view for each truck puts that on one page. Say you had planned to keep truck 3 for three more years. Now you can work out the cost of each option.

Chapter 02

What if I just fix it again, or overhaul the engine?

Fixing only today’s failure is the cheapest option this week, but it leaves the worn part that keeps failing. An engine overhaul costs far more up front and keeps the truck off the road longer. In return, it renews the engine, and nothing else. So the small repair wins when a failure happens once in a sound truck, or when you will sell the truck soon. The overhaul wins when the engine is the problem and you will run the truck long enough to spread its cost.

Consider the first option. You pay $3,500 to fix the leak, and truck 3 is back in two days. Two days at $400 add $800, so this road costs $4,300 today. But it leaves the worn engine in place. If the next 12 months go like the last 12, truck 3 will cost another $17,900 in repairs and lost days. The mechanic expects worse, not better. Over three years, that is $4,300 now and $17,900 a year after it: about $58,000, or $19,300 a year. And the engine is still worn at the end.

Federal safety rules also limit this option. A truck must not be driven “in such a condition as to likely cause an accident or a breakdown” (the rule on unsafe trucks). So patching is a choice only while the truck is safe to drive. If the mechanic says it is not, the choice is made for you.

Now go back to September 14 and consider the second option. You approve the overhaul: $28,000 and 15 working days. At $400 a day, the days cost $6,000, so this road costs $34,000.

A rented truck can cut the cost of those days. Say a rental company quotes $300 a day, all in. The rented truck hauls truck 3’s freight, and you pay the fuel, the driver and the rent. You lose $300 a day instead of $400. Over 15 days, that saves $1,500, and your driver keeps earning. A truck rented for 30 days or less may keep the rental company’s name and USDOT number on its doors. Then the rental agreement must name your company, with its address and USDOT number, and be kept in the truck the whole time (the marking rule). Ask your insurance agent to cover the rented truck before it moves.

What does the $34,000 buy? A rebuilt engine. If the history is right that the engine is the problem, it should also cut the breakdowns that cost you $17,900 last year. But nobody can promise by how much, and we found no reliable figure for how often a rebuilt engine fails. What the overhaul does not touch is the rest of the truck. The transmission, the axles, the brakes and the cab still have 780,000 miles on them. So before you approve it, ask the shop what its overhaul warranty covers and for how long, and get the answer in writing.

Time is what makes an overhaul pay. Spread over the three years you planned to keep truck 3, $34,000 comes to about $11,300 a year. Add whatever the rest of the truck needs. Patching comes to about $19,300 a year. But say you would keep the truck only one more year. Then the overhaul puts all $34,000 into that one year, which is far more than patching it. The final option has the highest initial cost.

Chapter 03

What does replacing the truck really cost?

Replacing costs the new truck’s price, less what the old one sells for. Add what it takes to put the new truck on the road. That last part is easy to forget. The new truck needs papers, a tax filing and an annual inspection before it hauls a load. And the old truck sits, or earns little, while you get it done. How you pay for the truck, and which truck to buy, is between you, your bank and your accountant. We do not advise on financing or dealers.

Consider the third option. The dealer’s 2022 tractor costs $85,000. Say a buyer offers $15,000 for truck 3 as it stands, worn engine and all. The truck itself then costs you $70,000.

Next comes the paperwork chain. The new truck needs a title and registration in your company’s name, plates and a place on your insurance policy. Titles and plates follow your State’s rules, and they vary. Before you use it, the truck must have passed an annual inspection in the last 12 months. The proof must ride on the truck (the annual inspection rule). It must carry your company’s name and USDOT number on both sides (the marking rule). And it gets its own maintenance file, as truck 3 had. Each step, and the order to do them in, is in our guide to adding or selling a truck.

There is a federal tax to file as well. For a truck of 55,000 pounds or more, you file Form 2290 for the heavy vehicle use tax. It is due by the last day of the month after the month you first drive the truck on a public road. Even the drive home from the dealer counts. The tax year now running began on July 1, 2026, and ends on June 30, 2027. A truck first used after July pays only for the months left. In the IRS’s own example, a full year’s tax on an 80,000 pound truck is $550. So if you first drive the new truck in September 2026, the form is due by October 31. That day is a Saturday, so the IRS gives you until the next business day, November 2, 2026 (the IRS instructions for Form 2290).

Truck 3 leaves papers behind, too. If you sell it before June 1 and do not use it again that tax year, you can claim back some of its 2290 tax. You get back what you paid for the months after the month of the sale. You claim it on your next Form 2290, or as a refund on Form 8849. Include the truck’s VIN, the date of the sale and the buyer’s name and address. Leave one out, and the IRS may refuse the claim (the IRS instructions). How to file Form 2290 and get back Schedule 1, the stamped page the IRS returns, is in our guide to Form 2290. Keep truck 3’s maintenance records for 6 months after it leaves your control (the maintenance rule). And take your name and USDOT number off its doors, so its next trips are not taken for yours. Our guide to disputing a crash in DataQs shows what happens when a sold truck’s crash lands on your record.

Replacing takes days too. Say it takes 10 working days from your decision to the new truck’s first load. If truck 3 sits all that time, that is another $4,000 of downtime. Some owners pay for the small repair so the old truck keeps earning while they shop. Then both bills go into the sum.

So the third road costs about $74,000 now: $70,000 for the truck and $4,000 in lost days. It also buys the most, a truck with 400,000 fewer miles. Say you would run it for five years. Spread over five years, $74,000 is about $14,800 a year. A newer truck breaks down too, though, and nobody can promise how often. Ask your insurance agent what the new truck will cost to insure, because its fixed costs may rise. A truck bought with a loan also adds a payment that truck 3 did not have. How the purchase and the sale count for taxes, including depreciation, is for your accountant to decide. Now you have a cost for each of the three options.

Chapter 04

So which option should I choose, and when does the answer change?

Choose the option with the lowest cost per year over the time you will really keep the truck. Then check that the truck still earns more than that. For truck 3, with every failure in the engine and three more years planned, that is the overhaul. The answer changes when the failures come from all over the truck, or when you will keep it only a short time. It also changes when the breakdowns start to eat all of its profit. Then replacing is the better road.

Here are the three options side by side, with truck 3’s numbers.

Read the table from the bottom. The overhaul costs least per year, but only because truck 3’s failures were all in the engine, and you will keep it three years. Patching looks cheap today and costs the most per year. Replacing costs the most today and buys the most years.

So on September 14 you approve the overhaul. You rent a tractor for the 15 days, which brings the bill to $32,500 and keeps your driver working. You put the shop’s written warranty in truck 3’s file. And from now on, each repair goes on its own line in the history the same day, so the next decision starts from the numbers.

Now change one fact. Say the history also showed the transmission slipping in March and the exhaust cleaning system failing in June. Then the overhaul fixes one problem out of three, and the breakdowns keep coming. The $34,000 buys little, and replacing becomes the better road. Change a different fact: say you planned to run truck 3 for one more year only. Then take the first road for $4,300, run the truck while it is safe, and replace it next year.

Every option also has a limit. On a normal day, truck 3 makes $150 of profit, about $36,000 a year. If its repairs and lost days climb past that, the truck costs more to keep than it earns, however you patch it. That is the time to replace it, or to sell it and run one truck fewer.

Whichever option you choose, planned service is where worn parts are meant to turn up: at a stop you chose, not on the shoulder. Our guide to a preventive maintenance schedule shows how to set one up for a small fleet.

There are things we could not check. We found no official or reliable figure for what an overhaul, a used truck, a rental or a day off the road costs. So every price here belongs to the example. We also found no reliable figures for how often rebuilt engines or newer used trucks break down, so we cannot predict their reliability. ATRI’s full report sits behind a registration page, so we used only the totals and percentages in its press release. What a newer truck costs to insure depends on your policy, so ask your agent. And titles and plates follow each State’s own rules.

Want someone to keep each truck’s repair history, spot the truck that keeps coming back and lay out your options? Here is what it costs.