How Many Miles Do Semi Trucks Last? Planning Replacement and Resale

Ask how many miles do semi trucks last and the usual answer is a round number, 700,000 or a million, with nothing behind it. Engines are rated that far. Whether the truck is still worth owning at that point is another matter, and it’s the one that costs money.

We’ve split the answer into four numbers that all get called a lifespan, added what tractors at each mileage are asking, and finished with a way to turn your own miles into a replacement date. We finance equipment, so we have a stake in how you handle financing a semi truck. The mileage math doesn’t depend on it.

How Many Miles Semi Trucks Last on Paper

A semi truck “lasts” in four different senses, and each comes from a different source. An engine maker’s life rating says how far an engine should run before a major overhaul. A federal rule sets an emissions period. A fleet’s trade cycle says when its owner sells. A listing says what a seller hopes to get.

Start with the engine maker. Diesel makers describe durability in B-numbers: B10 is the mileage by which 10 percent of a given engine would need a major rebuild, and B50 is the point where half would. Heavy Duty Trucking’s 2011 explainer put Detroit’s B50 at 1 million miles for the DD13 and 1.2 million for the DD15 and DD16. Call it a coin flip. Half the engines get there without a rebuild. Half don’t.

The federal row trips people up. Under 40 CFR §86.004-2, the “useful life” of a heavy heavy-duty diesel is 10 years, 435,000 miles, or 22,000 hours, whichever comes first, and the hours limit counts only when the manufacturer supplies an accurate hours meter with the engine. It’s the period over which the emissions limits apply. Not a forecast.

Fleets hide a second gap. In the National Private Truck Council’s benchmarking survey, as Heavy Duty Trucking reported it in 2023, heavy-duty tractors were traded at 6.35 years and 643,000 miles, about 101,000 miles a year. The average combination truck in the country covered 62,229 miles in 2021, according to the Department of Energy’s read of Federal Highway Administration data. At that pace 1.2 million miles is nineteen years of driving.

What Semi Truck Miles Mean at Resale

Now the part ratings skip. We re-cut the listings behind our dated asking prices for new and used tractors: Soarr’s used semi trucks as read on November 2, 2026, keeping the models built for highway hauling and dropping anything without a price or a mileage. That left 1,151 trucks.

Three in four sat between 200,000 and 600,000 miles. Only 121 showed 700,000 or more. Three crossed a million. Whatever the engines can do, the market is mostly trading trucks with less than half the miles in those ratings.

Price falls with miles. Model year muddies it, so we held the year still. These are medians of asking prices by odometer band.

Read the 2022 column down. Measured against each band’s median mileage, the ask fell about $12,200 per 100,000 miles between the first two bands, about $7,500 across the next step, and about $5,800 across the last. Early miles cost most. The late ones are cheap on resale.

A few cautions. These are asks. Dealers and fleets wrote them, not buyers. The 800,000-plus cells rest on nine and ten listings, so lean on them lightly. And model year pulls on price as well: across all mileages the median ask was $59,900 for 2022 and $43,002 for 2020.

Turning Miles Into a Replacement Date

The arithmetic is short. Choose the mileage you plan to sell at, using the table as a guide, subtract what’s on the odometer now, and divide by the miles you drive in a year. A tractor at 350,000 miles that runs 62,229 a year reaches 600,000 in about four years. Run it 100,000 a year and you’re there in two and a half.

Resale isn’t the whole bill. The same release says average truck age and annual mileage both rose in 2025. It doesn’t tie the two together. Neither will we. But a truck held past its trade date is where the repair line shows up.

Here’s the rule we’d use. Price the truck at the mileage it will have on the day you sell, not the one it shows today. Get an overhaul quote in writing from a heavy-truck shop that works on that engine, and ask what coverage is left on it. Then set the quote beside the net cost of moving up, meaning a newer truck’s asking price minus what yours would fetch. When the two are close, the newer truck deserves a serious look.

Check the starting number. Federal odometer disclosure, 49 CFR 580.17, exempts vehicles over 16,000 pounds gross vehicle weight rating, so a Class 8 title may show no mileage at all. Compare the ECM’s recorded miles with the service records, and read our guide to buying a used semi truck before you buy one or sell yours.

Paying for the Next Truck

Lenders set their own limits on used tractors, and some are tighter on older, higher-mileage trucks. The questions run close to the same: how old it is, what the odometer and the ECM say, what shape it’s in, and whether the VIN, title, and bill of sale agree. Ask what a lender’s limits are before you fall for a truck.

Then there’s the current loan. If you owe more than the truck would sell for, that gap rides along into the next purchase, so line up a payoff figure beside a realistic asking price before you shop. Refinancing a dealer’s truck loan is its own subject, laid out in what refinancing a truck loan involves.

What Owners Ask Before Replacing a Truck

Next Steps

Working out when to sell? Start with the table above. For the truck that replaces this one, see how semi truck financing works or start an application. Buying a first tractor instead? What starting a trucking company takes comes before the truck does.