Used Class 8 sleeper buyers

Used Semi With a Rebuilt Engine: Good Deal or Red Flag?

A driver on TruckersReport put it this way: "I have always seen people say buying a new truck is the best way to go. But is buying a used truck with a rebuilt engine good as well that after the overhaul has around 200,000 miles?"

By Trent Benoit, Owner-Op Truck Advisors

It's a fair question. A rebuilt engine can be good news, but only if you know exactly what was done. Until the paperwork backs it up, "rebuilt" on a listing is a claim, not a fact.

I'm Trent Benoit. I've spent 20+ years in trucking as a driver and an owner, so I've been the buyer myself, and I run Owner-Op Truck Advisors to help owner-operators make a clearer decision before a truck earns the next dollar. I take no dealer commissions. Here's how I'd handle a listing that says "rebuilt."

Is a rebuilt engine a good thing on a used semi?

Would I buy a truck with a rebuilt engine? Yes, if all the paperwork is there and it backs up the rebuild. Without paperwork that backs up the rebuild, you're buying an unknown.

So whether a truck started out new matters less than its history and records, and what the seller can show you about the engine in this truck. The invoice tells you how much weight to give the claim.

One owner on TruckersReport put the paperwork side bluntly: "If there was a rebuild but they cannot produce paperwork, I assume it was not done…" That's one buyer's rule, not a law, but it shows how seriously some buyers take the paperwork.

What "rebuilt" can mean

Not every rebuild is the same job. Here's how I break it down:

• Short block. Just the lower half of the engine.
• Long block. The lower block plus the cylinder heads and valvetrain.
• Turnkey. A complete top-to-bottom rebuild.
• Remanufactured (reman). The closest thing you'll get to a brand-new engine.

"Rebuilt" covers the first three. A reman is its own thing. So if a listing just says "rebuilt," it's telling you the engine isn't a reman, and your next question is what kind of rebuild was actually done. Listings also use words like "in-frame" or "overhaul." Whatever the word, ask for the invoice and see what work is actually on it.

Which job was right for a particular engine, and whether it was done right, is a call for a qualified mechanic. What the paperwork can do is show you exactly what was done.

The paperwork to ask for

When a seller says the engine was rebuilt, ask for the invoice and the work orders. Ask for copies you can keep, so you can compare them against the truck and against each other later. Make sure they answer these:

• Who did the work
• When it was done
• What kind of rebuild it was (short block, long block, turnkey) or whether it's a reman
• What parts were replaced
• What the mileage was at the time
• How many miles are on it since the rebuild
• Whether any warranty remains

Then ask for the rest of the truck's maintenance records. A rebuild invoice tells you about one job. The maintenance records tell you how the truck was treated before and after it.

What if the seller can't produce some of it? Missing paperwork doesn't automatically make a truck bad. It means you need to be more careful about what you assume, and more selective about which trucks are worth your time and travel. But if the rebuild itself has no paperwork behind it, you're back to buying an unknown.

A reply in that same TruckersReport thread adds two more worth asking: how many owners the truck has had, and whether it has ever had a salvage title. Check the title. If something about it doesn't look right, get it sorted out before you go any further.

There's a fuller list in the documents to get before you travel.

Make sure the paperwork belongs to this truck

A stack of receipts isn't proof until you know it's for this truck. One buyer on TruckersReport went back through his work orders after the engine failed and found that "half of them had another Vin and Unit number on them."

So match the VIN on every work order and invoice to the truck you're looking at. If the work was done at a shop, another driver's approach was to call the shop that did it and give them the VIN to confirm the rebuild. And read the records yourself, on your own time, without a salesman standing over you.

Ask about the numbers, too. What mileage does the invoice show for when the work was done? What does the odometer show now? Does the difference match the miles on the rebuild the seller gave you? If it doesn't, ask the seller to explain it.

If the paperwork is for a different unit, or the dates and mileages don't make sense, treat the rebuild as unproven.

Where a rebuilt engine fits in your buying decision

Miles since the rebuild don't tell the whole story on their own. In that forum thread, one longtime member pointed out that a truck with 200,000 miles on a rebuild probably had a lot more than that on it when the rebuild was done. That's his read, not a rule, but it raises questions worth asking the seller. What was the total mileage on the truck when the rebuild was done? Besides the engine work on the invoice, what else on the truck has been repaired or replaced, and are there records for it? Are the maintenance records available for the rest of the truck?

Here's the order to work in:

1. Documents first. Get the rebuild invoice, the work orders and the maintenance records. Match the VINs.
2. Ask the hard questions. How many miles are on the rebuild? What kind of rebuild was it, and are the records available? Are the maintenance records available?
3. Independent inspection on the strongest candidates. For the trucks that make the cut, arrange an independent inspection by a qualified mechanic who isn't working for the seller.
4. Then you decide.

A "DOT ready" claim doesn't replace step 3. Here's why: DOT ready is not a pre-purchase inspection. And none of this guarantees a truck is good. It just means you're deciding on what's documented instead of what's in the ad. The Used Semi Truck Buying Guide for Owner-Operators walks through the rest of the process, and there's more on judging thin listings in comparing listings that leave things out.