The LMM is the Duramax most people overlook, and that’s a mistake. It’s the last Duramax with the tough CP3 fuel pump, it makes more power than the LBZ, and there are plenty of good trucks out there that just need an engine. If your 2007.5 to 2010 Silverado or Sierra HD is down, we have a Duramax LMM engine for sale, tested, matched to your VIN and shipped to buyers worldwide.
Ready to buy? See the price, photos and stock for our fairly used Duramax LMM engine for sale in the shop.
We’re an engine supplier, and a Duramax LMM engine for sale is one of the engines we ship most often to truck owners and repair shops. If you already know what you need, send your VIN through our contact page or browse the Chevy engines in our shop.
This guide covers the specs, the trucks it fits, the particulate filter and how it affects the engine, the weak spots, how we test, and how buying from us works.
Table of Contents
Why a Duramax LMM Engine for Sale Makes Sense
The LMM arrived with the new-body trucks in the 2007.5 model year and stayed until 2010. It was GM’s answer to tighter emissions rules, and the big change was the diesel particulate filter. Some people wrote it off because of that. Many of them have changed their minds since.
Here’s why. The LMM kept the Bosch CP3 injection pump, which has a far better record than the CP4 that came on the next engine. It kept the strong LBZ-style bottom end. It made 365 horsepower and 660 lb-ft from the factory. And it didn’t need DEF, which arrived later with the LML.
So a good Duramax LMM engine for sale gives you a lot of what people love about the LBZ, in a newer, more comfortable truck. Prices on these trucks have held up, and owners want to keep them running.
Duramax LMM Engine Specifications
These are the numbers you’ll want when you compare any Duramax LMM engine for sale. The Duramax V8 engine article on Wikipedia covers the full family history.
| Engine type | 90-degree V8 turbo diesel, OHV, 4 valves per cylinder |
| Displacement | 6.6 litres (402 cubic inches) |
| Bore x stroke | 103 mm x 99 mm |
| Compression ratio | 16.8:1 |
| Block and heads | Cast iron block, aluminium cylinder heads |
| Fuel system | Bosch high-pressure common rail with CP3 pump |
| Turbocharger | Garrett variable geometry turbo, intercooled |
| Horsepower | 365 hp at 3,200 rpm |
| Torque | 660 lb-ft at 1,600 rpm |
| Emissions equipment | EGR with cooler, diesel particulate filter (DPF), no DEF |
| VIN engine code | 8th digit 6 |
| Oil capacity | About 10 quarts with filter |
| Approx. weight | Around 835 lb |
| Transmission | Allison 1000 6-speed automatic |
The power figures are close to the LBZ, but the extra emissions hardware means the LMM is tuned a little differently, and it does more work keeping its exhaust clean.
Which Trucks Use the LMM?
- 2007.5 to 2010 Chevrolet Silverado 2500HD and 3500HD (new body)
- 2007.5 to 2010 GMC Sierra 2500HD and 3500HD (new body)
- Some GM medium-duty trucks of the same era
Most LMM engines come out of the Chevrolet Silverado and Sierra HD pickups. Check the eighth digit of your VIN. On an LMM, it’s a 6.
The 2007 model year is where people get caught. GM sold the old-body Classic trucks with the LBZ alongside the new-body trucks with the LMM. If your 2007 is a Classic with a D in the VIN, you need our guide on the Duramax LBZ engine. If your truck is a 2011 or newer, look at the Duramax LML engine instead.
Medium-duty and commercial versions can use different brackets, oil pans and wiring. If that’s what you run, send us your VIN before ordering a Duramax LMM engine for sale.
LMM vs LBZ vs LML
- LBZ (2006 to 2007): No DPF, very popular, older truck body. Six-speed Allison or a manual.
- LMM (2007.5 to 2010): Adds the DPF, keeps the CP3 pump, new body, automatic only.
- LML (2011 to 2016): Adds DEF and switches to the CP4 pump, which has a mixed record.
These engines share a lot, but they don’t swap straight across. The computer, emissions parts, wiring and fuel systems differ. Make sure the Duramax LMM engine for sale you’re buying matches your truck. For the newest trucks, our Duramax L5P engine guide covers 2017 and later.
The DPF and What It Means for the Engine
The diesel particulate filter traps soot from the exhaust. Every so often the truck burns that soot off in a process called a regeneration, or regen. To do that, the engine injects extra fuel late in the cycle to heat the exhaust.
That works fine on trucks that run long distances. It causes problems on trucks that do lots of short trips, idle a lot, or never get hot enough to finish a regen. The filter clogs, the truck regens more often, and some of that extra fuel washes past the rings into the oil. That’s why some LMM owners see their oil level climb between changes.
This matters when you buy a Duramax LMM engine for sale, because an engine that spent its life in stop-start work with constant regens may have more ring and bearing wear than its mileage suggests. We look for fuel dilution signs when we test.
Some owners removed the emissions equipment. Rules on that vary a lot from country to country, and in many places it’s illegal on road vehicles. Check what applies where you live. We sell the engine and will tell you what’s attached to it, but the emissions setup on your truck is your call under your local law.
Other LMM Weak Spots
EGR valve and cooler
Soot builds up in the EGR valve and cooler, causing rough running, codes and lost economy. EGR coolers can also leak coolant.
Turbo vanes
The variable geometry turbo can stick from soot, causing boost problems. Cleaning or a rebuild often fixes it.
Injector wear
High-mileage injectors can return too much fuel or start to smoke. They’re outside the valve covers, so they’re easier to change than on the LB7.
Head gaskets on tuned engines
Stock LMMs rarely have trouble. Big tunes on factory head bolts can lift gaskets.
Water pump
Like every Duramax, the water pump eventually leaks.
Most LMMs we see that need replacing died from dust, overheating, coolant loss, fuel dilution over many years, or an aggressive tune.
How We Test Every Duramax LMM Engine for Sale
Every Duramax LMM engine for sale we list goes through these checks:
- Compression or leak-down on all eight cylinders
- Blow-by check
- Oil inspection for fuel dilution, coolant or metal
- Turbo shaft play and vane movement
- Look at the intake tract for dust or oil
- EGR cooler check for coolant leaks
- Inspection for leaks at the rear main and front cover
- Crank rotation by hand to feel for binding
- Mileage records and the donor VIN where we have them
You get photos of the actual engine and the results with your quote. Our page on tested used engines explains each test.
Used, Rebuilt or Remanufactured?
Used
Pulled from a donor truck, tested and sold with a warranty. A used Duramax LMM engine for sale is the best value for most owners and usually comes with the injectors, CP3 pump and turbo already on it.
Rebuilt
Repaired with new parts as needed. Ask exactly what was replaced.
Remanufactured
Machined and rebuilt to spec, often sold as a long block without the fuel system or turbo. Expensive once you add those back.
Our replacement engine cost guide shows how each option adds up.
7 Checks Before You Buy Any Duramax LMM Engine for Sale
1. Confirm it’s an LMM
Check the VIN code and the donor truck. A 6 in the eighth digit means LMM.
2. Ask how the truck was used
Highway miles are kinder to an LMM than short trips and idling.
3. Check for fuel in the oil
A fuel smell or thin oil points to heavy regen history or a leaking injector.
4. Get compression numbers
Real numbers for every cylinder, not a promise.
5. Ask about tuning
Moderate tunes are fine. Big tunes on stock head bolts are a risk.
6. Read the warranty
Our used engine warranty article explains what to check.
7. Confirm what’s included
Injectors, CP3, turbo, EGR parts, harness? Get it on the quote. A Duramax LMM engine for sale that arrives missing parts you assumed were included isn’t a bargain.
What Comes With Our Duramax LMM Engine for Sale
Our LMM engines usually ship complete or as a long block with the main parts fitted. Every Duramax LMM engine for sale comes with a written list of what’s attached. A typical complete engine includes:
- Block, heads and rotating assembly
- Injectors and fuel rails (condition noted)
- CP3 high-pressure pump
- Variable geometry turbocharger
- Intake, EGR valve and cooler
- Valve covers, oil pan and front cover
The DPF, computer, harness and transmission aren’t included unless we agree in writing.
Signs Your LMM Is Finished
- A knock from the bottom end
- Heavy blow-by and oil pushed out of the breather
- Low compression on one or more cylinders
- Falling oil pressure when hot
- Metal in the oil or filter
- Coolant disappearing with no outside leak
A sooted EGR, a sticky turbo or a leaking water pump is a repair. The list above usually means it’s time for a Duramax LMM engine for sale, because rebuilding a Duramax means a lot of machine work and parts.
The Allison Behind It
Every LMM truck came with the six-speed Allison 1000. If yours is slipping or harsh, deal with it while the engine is out. We also sell the Allison 1000 transmission, and our Allison 1000 guide explains what to check.
Towing With an LMM
The LMM is a strong tow engine, and long hauls with a trailer are actually good for it, because the exhaust gets hot enough for clean regens. Keep the radiator, intercooler and transmission cooler clean, watch temperatures on long climbs, and use good fuel. Treat it right and your Duramax LMM engine for sale will pull like the factory engine did.
Fuel Quality and Filtration
The CP3 pump is tough, but no common-rail system likes water or dirt. Change the fuel filter on time and drain the water separator. If you buy fuel in places where quality varies, add extra filtration. If the old engine failed because of contaminated fuel or a failed pump, flush the tank and lines before the new engine goes in.
Running Costs After the Swap
Plan on normal diesel maintenance: oil changes every 5,000 to 7,500 miles, more often if the truck does short trips and lots of regens; fuel filters on schedule; coolant checked and replaced at the right interval; and a clean air filter. Check the oil level between changes. A rising level means fuel is getting in. There’s no DEF to buy, which keeps costs below a newer diesel, and it’s one more reason a Duramax LMM engine for sale is good value.
Keeping Heat Under Control
Dirt and bugs packed between the intercooler, transmission cooler and radiator cut cooling badly. Clean the stack each season, use the correct coolant and keep it fresh, and fit a gauge or scan tool to watch temperatures when towing. Small habits like these are what keep a Duramax running past 300,000 miles.
Adding Power to an LMM
The LMM responds well to tuning, and the CP3 pump supports more fuel than the stock setup uses. Keep it sensible on stock internals. For serious power you’ll want head studs and a stronger transmission. Tell us about your plans and we’ll help you pick a Duramax LMM engine for sale that suits them.
Is an LMM Better Value Than an LML?
For a lot of buyers, yes. The LML is newer and makes more power, but it uses the CP4 pump, which can fail and send metal through the whole fuel system, and it needs DEF. The LMM keeps the more forgiving CP3 and skips DEF entirely. If you’re choosing between trucks, or between engines for a project, a Duramax LMM engine for sale is often the smarter long-term buy. If you already own an LML truck, though, stick with an LML. Swapping generations means changing computers, wiring and emissions parts, and it’s rarely worth the trouble.
Commercial and Fleet Trucks
A lot of LMM trucks spent their lives working for companies: utility trucks, service bodies, flatbeds and plow trucks. They tend to idle a lot and do short trips, which is the hardest life for a DPF engine. If you run a fleet, it’s worth keeping a spare Duramax LMM engine for sale on the shelf, so one failure doesn’t park a truck for weeks. Ask about buying two, because shipping them together lowers the freight cost per engine. Commercial and medium-duty versions can use different brackets and wiring, so send us the VIN first.
Putting an LMM in Something Else
The LMM isn’t as common in swaps as the LB7 or LBZ, mostly because of its emissions hardware and computer. It can be done. You’ll need the engine computer and harness, an exhaust setup that meets the rules where you live, a fuel system suited to a common-rail engine, good cooling, and mounts and a transmission setup that fit. Ask whether we have a Duramax LMM engine for sale with its matching computer and harness. Rules on swaps and emissions differ a lot by country, so check before you start.
What Affects the Price
- Mileage and how the truck was used
- Tuning history
- Complete engine or long block
- Injector, turbo and CP3 condition
- Pickup or medium-duty version
- Shipping distance
A very cheap Duramax LMM engine for sale with no photos and no test results is a gamble. Compare what’s included, not just the price.
Shipping Worldwide
We ship to buyers across North and South America, the Caribbean, Europe, Africa, the Middle East, Asia and Oceania. Every Duramax LMM engine for sale is drained, sealed, strapped to a pallet and wrapped. For export orders we handle the paperwork and work with your freight forwarder or ours. Freight is quoted by weight and destination. See our shipping policy.
How to Order a Duramax LMM Engine for Sale
- Send us your VIN and location.
- We confirm the fit and send photos, test results and a written quote with freight.
- You approve the quote and pay by bank transfer, which is the only payment method we accept.
- We crate and ship the engine and send tracking.
- You install it and keep the paperwork for the warranty.
You can also browse the full used engines catalogue or the shop.
Install Tips
- Replace the air filter and check the intake ducting for leaks.
- Clean the intercooler and pipes, especially after a turbo or piston failure.
- Change the fuel filter and bleed the fuel system.
- Refill and bleed the cooling system with the correct coolant.
- Prime the oil system before first start.
- Clean or replace a sooted EGR valve, and check the EGR cooler for leaks.
- Check the DPF condition. A badly clogged filter will cause problems for a healthy new engine.
Do the install right and your Duramax LMM engine for sale will give you years of work.
When Your Engine Arrives
Inspect the crate before you sign for it. If the pallet is broken or the wrapping is torn, take photos straight away, before anything is moved, and write it on the delivery receipt so the freight company can’t argue later. Check the engine against the list on your quote and keep it covered and dry until it goes in.
Who Buys a Duramax LMM Engine for Sale From Us?
Owners keeping a good 2008 or 2009 truck on the road. Contractors and farmers. Hot-shot drivers. Repair shops that need a tested engine for a customer. Exporters rebuilding trucks for other markets. They all want an honest description and an engine that runs right.
Other Engines We Supply
Besides the Duramax LMM engine for sale, we stock the Duramax LB7, GM gas big-blocks like the Vortec 8.1, and other diesels including the 6.7 Cummins and 6.7 Powerstroke. New to buying online? Read how to buy a used engine online and low-mileage used engines.
Why Buy From NJ Global Auto Parts
We only sell engines. We test them, describe them honestly and ship them worldwide. We confirm the fit before you pay. Every Duramax LMM engine for sale from us comes with real photos, a written quote, tracking and a written warranty. Our refund and returns policy is there to read before you order.
Frequently Asked Questions
What years is the LMM Duramax?
2007.5 to 2010 new-body Silverado and Sierra HD trucks.
Does the LMM have a CP4 pump?
No. It uses the CP3. The CP4 arrived with the LML in 2011.
Does the LMM need DEF?
No. DEF came with the LML.
Will an LBZ fit my LMM truck?
Not as a straight swap. The computer, emissions parts and wiring differ.
Does your Duramax LMM engine for sale include injectors?
Complete engines usually do. Their condition goes on the quote.
Why does my LMM’s oil level go up?
Usually fuel from regenerations washing past the rings, especially on trucks that do short trips. A leaking injector can do it too. Change the oil more often and get the cause checked.
How many miles will an LMM last?
With clean air, good fuel and regular oil changes, 300,000 miles or more is common. Dust, overheating and years of fuel dilution are what usually end them early.
Do you ship worldwide?
Yes. We ship every Duramax LMM engine for sale worldwide and handle the export paperwork.
How do I pay?
Bank transfer only. The details come with your quote.
How do I get a quote?
Send your VIN through our contact page, call +1 (209) 733-0882, or WhatsApp +1 209 690 5983.
Get Your Duramax Working Again
A sorted LMM truck is a great truck to own. If you need a Duramax LMM engine for sale that’s been tested, matched to your VIN and shipped with tracking, get in touch today. We’ll confirm the fit, send photos and give you a straight price, wherever you are.