How much does a used engine or transmission cost?

Price depends on the year, make, model, mileage, and part - a 4-cylinder economy engine and a diesel truck engine are very different jobs. Use the part finder or call us for a free, no-obligation quote on your exact vehicle; every quote confirms availability and compatibility before you pay.

Are your used engines and transmissions tested?

Yes. Every used engine and transmission is compression- and oil-pressure tested and put through a rigorous inspection process by automotive experts before they ship.

What warranty comes with a part?

Every engine and transmission includes a 12-month parts-replacement warranty, plus lifetime support from ASE-certified experts. Approved claims are handled by replacement or store credit - we do not issue cash refunds. Labor is not covered on the standard warranty. You can upgrade to 3-year parts and labor coverage for $499 at the time of purchase. Full warranty details are provided with your order.

Can I get a longer warranty that covers labor?

Yes. The standard coverage is 12 months on parts. For $499 you can upgrade to a 3-year warranty that covers both parts and labor, purchased at the time of your order. Ask your specialist to add it when you confirm your part.

How long does shipping take, and what does it cost?

Shipping is free to a commercial business address or your local freight terminal and typically arrives in 5-7 business days. Residential delivery is $175 and includes a liftgate, a smaller delivery truck and a scheduled appointment. We ship to the lower 48 only.

What is the difference between a remanufactured and a rebuilt engine?

Remanufactured engines have all brand-new internal parts plus all aftermarket and OEM upgrades and updates, whereas rebuilt engines are reconditioned used engines that keep many used parts on them.

What components are included with a used engine?

The engine assembly includes the main internal parts - block, head, piston, camshaft, crankshaft - and other components. It does not include the AC compressor, starter, alternator, or power steering pump. Additional parts left on the engine block are included for your convenience but are not covered by warranty.

How do I place an order, and how can I pay?

Search your part on the website and place the order, or call us at (830) 999-7278. We accept all major credit cards - Visa, MasterCard, American Express, and Discover - as well as Zelle, ACH, and cashier’s checks or money orders by mail. Mailed payments take longer to clear; once received, we verify your order and ship per our delivery commitment.

Can I pick up my part in person?

No - we are an online business with no walk-in sales or local pickup. Our inventory ships from multiple supplier locations, and every order comes with free freight to a commercial address or your local freight terminal instead.

Where are you located?

Car Part Headquarters, LLC is based at 1811 S Laredo St, San Antonio, TX 78207, and ships from distribution centers nationwide for fast delivery anywhere in the country.

How many miles is too many for a used engine?

There is no single cutoff, because a 120,000-mile engine with documented highway use and full service records often outlasts an 80,000-mile engine from a neglected car. Mileage matters less than the donor vehicle's maintenance history and the reason it was scrapped. A collision write-off with a healthy drivetrain is usually a better donor than a low-mileage car retired for engine trouble.

What is a Hollander interchange number and why does it matter?

The Hollander interchange number is the industry's universal part-numbering system, created in the 1930s so salvage yards could tell which parts swap between vehicles. Two vehicles sharing the same Hollander number use the same part. It is the single most reliable way to confirm an engine fits your car, because the same displacement can come in several incompatible versions across trim levels and build dates.

Should I buy a used engine or a remanufactured one?

A used engine is pulled from a donor vehicle and sold as-is after inspection, so it costs less and keeps the original factory tolerances. A remanufactured engine is disassembled and rebuilt to a specification with new wear components, which costs more and typically carries a longer warranty. Choose used when the donor is verified and the price gap is wide; choose remanufactured when the engine is high-mileage across the board or the vehicle is a long-term keeper.

Do I need a compression test on a used engine?

Ask for compression or leak-down readings whenever the supplier can provide them, and treat a refusal as a warning. Gasoline engines generally read in the 125 to 160 PSI range when healthy, but the more useful signal is consistency: cylinders within roughly 10 percent of each other indicate even wear, while one low cylinder points to a valve or ring problem you will inherit.

What should a used engine warranty actually cover?

Read for three things: the length in days or miles, whether it covers parts only or parts and labor, and what voids it. Most claims are denied on installation grounds, so the coverage is only as good as your documentation. Car Part Headquarters includes a 12-month parts-replacement warranty, and keeping your installation records is what keeps it intact.

How do I verify the donor vehicle a used engine came from?

Ask for the donor VIN and run it through the free NHTSA VIN decoder, which returns the year, make, model, and engine specification the factory built. That confirms the engine is the version your car needs and gives you a paper trail. A supplier who will not share the donor VIN is asking you to trust an engine with no history.

How long does it take to get a used engine delivered?

Delivery depends on where the engine is sourced and where it ships. Car Part Headquarters ships in 5-7 business days, free to a commercial address or freight terminal, with residential delivery available for an additional charge.

Guides & advice

What to Check Before Buying a Used Engine

Updated September 4, 2026 5 min readCar Part Headquarters

Short answer

Before you buy a used engine, verify five things in writing: the donor vehicle's mileage and VIN, a compression or leak-down reading, the Hollander interchange number that proves the engine fits your exact vehicle, what the warranty actually covers, and whether the seller inspected the engine before listing it. A supplier who cannot produce those five on request is selling you an unknown.

A used engine is the cheapest way to keep a sound vehicle on the road, and the fastest way to lose money if you buy the wrong one. The difference is not luck. It comes down to whether you verified the engine before it shipped, or trusted a listing photograph.

What a used engine actually is

A used engine is pulled from a donor vehicle, inspected, and resold with its original factory machining intact. Most donors are collision write-offs, which is why a low-mileage engine can come out of a car that never had a mechanical fault. A remanufactured engine takes a different path: it is stripped, machined, and rebuilt with new wear components to a published specification. Kelley Blue Book notes that remanufactured units usually carry the longer warranty, while used units win on price and on keeping original factory tolerances.

Neither option is automatically correct. The right one depends on the donor you can verify and the price gap in front of you.

The 14 checks, in the order they matter

1. Donor vehicle VIN. Ask for it first. The free NHTSA VIN decoder returns the year, make, model, and factory engine specification for any 17-digit VIN. A supplier who will not release the donor VIN is asking you to buy an engine with no history.

2. Hollander interchange number. Hollander has been the universal part-numbering system for salvage since the 1930s. Two vehicles sharing a Hollander number use the same part. Matching that number is more reliable than matching displacement, because a single 5.4L or 2.0L can ship in several incompatible versions.

3. Donor mileage, with a source. A stated mileage is worth nothing without the odometer reading or title record behind it.

4. Why the donor was scrapped. A collision write-off with a healthy drivetrain is a better donor than a low-mileage car retired for engine failure.

5. Compression or leak-down readings. Healthy gasoline engines generally read 125 to 160 PSI, but consistency matters more than the absolute number. Cylinders within roughly 10 percent of each other indicate even wear.

6. Flood and water damage history. Engines out of water-damaged vehicles do get resold as good units. The donor VIN and title status are how you catch them.

7. Build date and mid-year changes. Manufacturers change engines mid-model-year. A build date on the door jamb can be the difference between a bolt-in fit and a returned part.

8. Included accessories. Establish in writing whether the intake manifold, sensors, injectors, and flexplate come with the engine or are your responsibility.

9. Oil condition. Metal particles in the oil mean bearing wear. A supplier who has inspected the engine can tell you what came out of it.

10. Visible external condition. Cracked housings, stripped bolt holes, and a heavily corroded block are visible in photographs when a seller is willing to take them.

11. Warranty length and type. Parts-only and parts-and-labor are very different products at the same headline number.

12. What voids the warranty. Most denied claims are installation-related. Read this clause before you buy, not after.

13. Core charge and return terms. Know what you owe if the engine has to go back, and who pays the return freight.

14. Freight terms. Commercial address, residential delivery, and freight terminal pickup carry different costs and timelines.

Why the verification step matters more than the price

Engine replacement is a labor-heavy job. The part is only part of the bill, and pulling a failed used engine back out means paying that labor twice. A supplier who inspects and documents before shipping is not adding cost, they are removing the scenario where you pay for the same installation two times.

The Automotive Recyclers Association maintains certification standards for exactly this reason: recycled parts sold with documented handling and inspection behave differently in the field than parts sold sight-unseen.

The strategy that works

Ask for the donor VIN and the interchange number before you discuss price. Both are free to provide, both take a supplier seconds to look up, and both are impossible to fake convincingly. A seller who answers those two questions quickly and specifically is a seller who has the engine in front of them and knows its history.

Then read the warranty for what voids it, and write down your installation steps as you go. Coverage you cannot document is coverage you do not really have. Our free pre-installation and warranty checklists exist for that reason.

Common mistakes

Buying on displacement alone is the most expensive error, because the same displacement ships in incompatible versions. Skipping the donor VIN is the second. Assuming the accessories are included is the third, and it usually surfaces on installation day when the shop is already billing hours.

The last common mistake is treating the lowest quote as the best one. A quote without an interchange number attached is a guess about which engine you are getting.

When a used engine is the right call

A used engine makes sense when the vehicle is otherwise sound, the donor is verifiable, and the price gap against remanufactured is wide. Fleet vehicles, work trucks, and second cars are strong candidates, because the goal is reliable service rather than a factory-fresh drivetrain.

When it may not be

If your engine failed from a known design fault that the donor engine shares, a used unit inherits the same fault. If the vehicle is a long-term keeper with high mileage throughout the drivetrain, a remanufactured engine and its longer warranty is usually the better economics. And if no supplier can produce a verified donor for your application, waiting is cheaper than guessing.

Federal disclosure rules under the FTC Used Car Rule apply to used vehicles rather than individual parts, but the underlying principle carries: the terms should be in writing before money changes hands.

The takeaway

Verify the donor VIN, match the Hollander interchange number, read what voids the warranty, and document the installation. Those four steps eliminate most of the risk in buying a used engine.

Car Part Headquarters is a 3rd-generation auto parts supplier with access to 2,000+ salvage yards, and every engine ships with a 12-month parts-replacement warranty and free freight to a commercial address in 5-7 business days. Tell us your year, make, model, and VIN, and a specialist confirms the exact interchange match before you pay. Get a price on your engine or call (830) 999-7278.

Frequently asked questions

How many miles is too many for a used engine?: There is no single cutoff, because a 120,000-mile engine with documented highway use and full service records often outlasts an 80,000-mile engine from a neglected car. Mileage matters less than the donor vehicle's maintenance history and the reason it was scrapped. A collision write-off with a healthy drivetrain is usually a better donor than a low-mileage car retired for engine trouble.
What is a Hollander interchange number and why does it matter?: The Hollander interchange number is the industry's universal part-numbering system, created in the 1930s so salvage yards could tell which parts swap between vehicles. Two vehicles sharing the same Hollander number use the same part. It is the single most reliable way to confirm an engine fits your car, because the same displacement can come in several incompatible versions across trim levels and build dates.
Should I buy a used engine or a remanufactured one?: A used engine is pulled from a donor vehicle and sold as-is after inspection, so it costs less and keeps the original factory tolerances. A remanufactured engine is disassembled and rebuilt to a specification with new wear components, which costs more and typically carries a longer warranty. Choose used when the donor is verified and the price gap is wide; choose remanufactured when the engine is high-mileage across the board or the vehicle is a long-term keeper.
Do I need a compression test on a used engine?: Ask for compression or leak-down readings whenever the supplier can provide them, and treat a refusal as a warning. Gasoline engines generally read in the 125 to 160 PSI range when healthy, but the more useful signal is consistency: cylinders within roughly 10 percent of each other indicate even wear, while one low cylinder points to a valve or ring problem you will inherit.
What should a used engine warranty actually cover?: Read for three things: the length in days or miles, whether it covers parts only or parts and labor, and what voids it. Most claims are denied on installation grounds, so the coverage is only as good as your documentation. Car Part Headquarters includes a 12-month parts-replacement warranty, and keeping your installation records is what keeps it intact.
How do I verify the donor vehicle a used engine came from?: Ask for the donor VIN and run it through the free NHTSA VIN decoder, which returns the year, make, model, and engine specification the factory built. That confirms the engine is the version your car needs and gives you a paper trail. A supplier who will not share the donor VIN is asking you to trust an engine with no history.
How long does it take to get a used engine delivered?: Delivery depends on where the engine is sourced and where it ships. Car Part Headquarters ships in 5-7 business days, free to a commercial address or freight terminal, with residential delivery available for an additional charge.