A Silverado or Sierra HD with a dead diesel is a very expensive driveway ornament. These trucks tow trailers, haul equipment and run businesses. When the engine goes, you need it replaced properly and quickly. We have a Duramax LML engine for sale, tested and ready to ship, whether your truck is across town from us or on another continent.
Ready to buy? See the price, photos and stock for our fairly used Duramax LML engine for sale in the shop.
This page covers the LML’s specs, the trucks it fits, the well-known fuel pump issue, emissions equipment, and how buying from us works. We sell complete engines and confirm fitment before you pay.
Table of Contents
Why a Duramax LML Engine for Sale Is in Such Demand
The LML is the 6.6 litre Duramax V8 turbo diesel GM fitted to its heavy-duty Chevrolet and GMC pickups from 2011 to 2016. It sits between the older LMM and the newer L5P. It brought a big jump in power and torque, a more advanced fuel system, and modern emissions equipment.
These trucks work hard. A lot of them have towed heavy trailers for hundreds of thousands of miles. When an LML fails, owners rarely want to give up the truck. The cab, chassis and Allison transmission are often fine. They just need a healthy engine, and that’s why a tested Duramax LML engine for sale is such a common request.
Duramax LML Engine Specifications
Every Duramax LML engine for sale we list is checked against these core figures before it’s offered.
| Specification | Duramax LML |
|---|---|
| Engine type | V8 turbo diesel, intercooled |
| Displacement | 6.6 L (6,599 cc) |
| Bore x stroke | 103 mm x 99 mm (4.06 in x 3.90 in) |
| Valvetrain | Overhead valve, 4 valves per cylinder (32 valves) |
| Fuel system | High-pressure common rail, piezo injectors, Bosch CP4 pump |
| Injection pressure | Up to about 29,000 psi |
| Turbo | Variable-geometry turbo with intercooler |
| Power | 397 hp at 3,000 rpm |
| Torque | 765 lb-ft at 1,600 rpm |
| Redline | About 3,450 rpm |
| Emissions | DPF, urea (DEF) injection, EGR, oxidation catalyst |
| Biodiesel | Up to B20 |
| Years | 2011 to 2016 |
For the full family history, from the original LB7 through to the current L5P, see the Duramax V8 engine overview.
Piezo injectors and very high pressure
The LML’s fuel system runs at extreme pressure with fast piezo injectors. That’s how it makes so much torque so cleanly. It’s also why fuel quality and filtration matter so much on this engine.
Variable-geometry turbo
The VGT adjusts its vanes for quick response at low speed and strong boost higher up. It also acts as an exhaust brake on many trucks. Carbon build-up can make the vanes sticky over time, so we check vane movement on every Duramax LML engine for sale.
Emissions equipment
The LML was GM’s first Duramax with urea injection (DEF), alongside a particulate filter and EGR. Those systems need to work properly for the truck to run as designed.
LMM, LML or L5P: Know Which Duramax You Have
GM made several generations of the 6.6 Duramax, and they’re easy to confuse. The three you’ll see most in this era are:
- LMM (roughly 2007.5 to 2010): the LML’s predecessor, with a different fuel system and no DEF.
- LML (2011 to 2016): the engine on this page, with the CP4 pump, piezo injectors and DEF.
- L5P (2017 on): the newer engine with a different block, fuel system and electronics.
They look similar from above, but they aren’t interchangeable without major changes to wiring, fuel system, engine computer and emissions parts. The easiest way to be sure is your VIN. The eighth character identifies the engine, and for the LML it’s an “8”. Send us your VIN and we’ll confirm that a Duramax LML engine for sale is the right match, or point you to the right engine if it isn’t.
Where Our LML Engines Come From
Most of our LML engines come from trucks retired after accidents, body damage or fleet changes. Heavy-duty pickups often get written off for damage that has nothing to do with the engine, so there’s a decent supply of healthy cores. Mileage and history vary, which is why we test every one.
We record the donor truck’s details for each Duramax LML engine for sale, including mileage where we have it, so you know what you’re getting. If the donor truck had a known fuel system issue, we tell you.
Which Trucks Use the Duramax LML?
- Chevrolet Silverado 2500HD and 3500HD (2011 to 2016)
- GMC Sierra 2500HD and 3500HD (2011 to 2016)
Most of these trucks pair the LML with the six-speed Allison 1000 automatic. A related lower-output version, the LGH, was used in some vans and chassis cab trucks. It’s not the same engine as the LML, so check the engine code before you order. Send us your VIN and we’ll confirm which Duramax LML engine for sale matches your truck.
The CP4 Fuel Pump: What You Should Know
We can’t talk about the LML without mentioning the fuel pump. The LML uses a Bosch CP4 high-pressure pump, and failures of this pump on LML trucks have been widely reported.
When a CP4 fails, it can send metal debris through the whole fuel system: rail, lines and injectors. A pump failure on its own is a big repair bill. If debris reaches the engine, it gets worse.
Here’s what that means for buyers:
- If your LML died from a pump failure, the whole fuel system usually needs cleaning or replacing, not just the engine. Fitting a fresh engine to a contaminated fuel system can ruin it.
- Many owners fit a conversion or upgraded pump kit to reduce the risk. Ask your diesel specialist about the options in your country.
- We inspect the fuel system on every Duramax LML engine for sale for signs of contamination before we offer it.
What Comes With Our Duramax LML Engine for Sale
Our standard Duramax LML engine for sale is a complete engine from a donor truck. Depending on the unit and your order, it usually includes:
- Block with crankshaft, pistons and rods
- Both cylinder heads with valvetrain
- High-pressure pump, rails and injectors (condition confirmed on your quote)
- Variable-geometry turbocharger
- Intake and exhaust manifolds, EGR components
- Alternator and other ancillaries on many units
The Allison transmission, engine computer and wiring aren’t included unless we agree it in writing. Some customers order the engine without the fuel system because they’re fitting an upgraded pump setup. Tell us what you need.
How We Test Every LML
- Compression test on all eight cylinders.
- Fuel system inspection for metal or contamination from pump wear.
- Oil check for coolant, fuel dilution or metal.
- Turbo check for shaft play and vane movement.
- Visual inspection of the block, heads and EGR system for leaks and cracks.
- Photos and video sent to you before crating.
Every Duramax LML engine for sale that ships from us has passed these checks.
Used, Reconditioned or Rebuilt?
Used
A tested engine from a donor truck, sold as it came out. The most affordable option, and a sensible one if the compression and fuel system check out.
Reconditioned
A used engine with gaskets, seals and service items renewed, and the fuel system cleaned or partly replaced. A good choice for a truck that tows every day.
Rebuilt
Stripped, machined and rebuilt with new internal parts. The most expensive, and the closest to new.
For a truck that tows heavy every week, the extra cost of a reconditioned or rebuilt Duramax LML engine for sale often pays for itself. Tell us how you use the truck and we’ll recommend honestly.
Common LML Problems
CP4 pump failure
The big one, covered above. It can take out the whole fuel system.
DEF and DPF system faults
Sensor faults, heater failures and clogged filters can put the truck into reduced power. Usually fixable without a new engine, so get them diagnosed before you start shopping for a Duramax LML engine for sale.
EGR problems
EGR valves and coolers can clog or leak. A leaking EGR cooler can cause coolant loss.
Injector issues
Piezo injectors are precise and expensive. Poor fuel or contamination damages them.
Turbo vane sticking
Carbon build-up can make the VGT vanes stick, causing poor boost or over-boost codes.
Repair or Replace?
Many LML problems are fuel, emissions or sensor issues, not engine failures. We’d rather you fix those than buy an engine you don’t need.
A good diesel shop can tell a lot from a few tests: compression or a relative compression test, a check of fuel rail pressure, a look at injector balance rates, and an oil analysis. If compression is even and the oil shows no metal or coolant, the core is probably healthy. If one bank is weak, or the oil shows signs of a failing bearing or coolant contamination, it’s time to look at a replacement. Share those results with us before you buy a Duramax LML engine for sale from anyone, and we’ll help you read them honestly.
Replacement makes sense when there’s low or uneven compression, a spun bearing, piston or cylinder damage from contaminated fuel, or a cracked head. At that point, a rebuild of a big diesel V8 is very expensive and slow, and a tested Duramax LML engine for sale is often the faster route back to work. Send your mechanic’s findings and we’ll give you a straight answer.
Towing With an LML
Towing is what most LML trucks were bought for, and it’s also what wears them out. With 765 lb-ft on tap and the Allison behind it, the LML pulls heavy fifth-wheel and gooseneck trailers well. But towing heavy for long distances puts sustained heat and load through the engine, turbo and cooling system.
If your truck tows often, a few habits help a lot. Watch transmission and coolant temperatures on long climbs. Use the exhaust brake on descents rather than cooking the service brakes. Give the engine a minute to cool at idle after a hard pull before shutting off. And keep up with oil and fuel filter changes, because towing makes everything work harder.
Tell us if your truck is a heavy tow rig. It can change which Duramax LML engine for sale we suggest, because a reconditioned unit with fresh seals and a cleaned fuel system often makes more sense for a truck that works that hard. A healthy Duramax LML engine for sale fitted with care will handle years of towing.
Fuel Pump Upgrade Options
Because of the CP4’s reputation, a lot of LML owners fit an upgraded or converted high-pressure pump when they replace the engine. The idea is to lower the risk of a repeat failure that takes out the fuel system again.
Options and their legality vary by country, so talk to a diesel specialist near you. What matters for your engine purchase is simple: if you plan to fit a different pump setup, tell us. We can supply the engine with or without its original fuel system, which can save you money on parts you’d be replacing anyway.
Fitment Checklist
Before we confirm any Duramax LML engine for sale, we ask for:
- Truck make, model and year
- VIN (the engine code is in the VIN)
- 2500HD or 3500HD, single or dual rear wheels
- Whether your fuel system is contaminated from a pump failure
- Emissions requirements in your country
- Photos of your current engine
Emissions and Local Rules
The LML was built with full emissions equipment, and in many countries it must stay that way. We supply engines with their emissions components as designed. Rules on imported engines and emissions vary a lot from country to country, so check with your local authority or importer before ordering. We won’t advise removing emissions equipment.
Other Diesel Engines We Supply
Comparing options or running a mixed fleet? We also sell the Cummins ISB, the Cummins 6BT, and a wide range of used diesel truck engines. For petrol GM trucks, see our used Chevy engines, LS engines and 5.3 Vortec pages. Ford owners can check the Ford F-150 engine page. Browse the whole shop for more.
Installation Tips
We send these notes with every Duramax LML engine for sale:
- Clean or replace the fuel system if the old engine had a pump failure. Tank, lines, rails and filters.
- Fit new fuel filters and use clean, quality diesel.
- Prime the fuel system properly before first start.
- Fresh oil, filter and coolant.
- Check the DEF, DPF and EGR systems work correctly.
- Clear old fault codes and check live data once it’s running.
- Avoid heavy towing for the first few hundred miles.
Looking After Your LML
- Change fuel filters on time and drain water from the separator.
- Buy fuel from busy stations with good turnover.
- Change oil regularly, especially when towing.
- Let the DPF regenerate with longer drives now and then.
- Use quality DEF and keep the tank topped up.
Who Buys an LML From Us
Owner-operators and contractors who tow for a living. They need the truck back on the road fast, and they often choose a reconditioned engine.
Ranchers and farmers pulling livestock trailers and equipment. Reliability matters more than anything else to them.
Overseas buyers running imported American trucks in places where Duramax engines are hard to find locally.
Repair shops that need an engine for a customer’s truck after a pump failure.
Tell us which group you’re in, and we’ll help you pick the Duramax LML engine for sale that suits the work your truck does.
What a Healthy Used LML Looks Like
- Even compression across all eight cylinders
- No metal in the fuel system or fuel filters
- Clean oil with no coolant or heavy fuel dilution
- A turbo with free-moving vanes and minimal shaft play
- No coolant leaks around the EGR cooler or heads
Importing a Duramax: Mistakes to Avoid
- Ordering the wrong generation. LMM, LML and L5P aren’t interchangeable.
- Ignoring the fuel system. A contaminated system will destroy a fresh engine.
- Forgetting local emissions rules and import duties.
- Underestimating freight. This is a heavy engine. Plan for collection equipment.
- Buying without photos. Ask to see the actual Duramax LML engine for sale, including its engine number.
Fleets and Repeat Buyers
If you run several HD trucks, ask about buying more than one engine at a time. Shipping engines together usually lowers the freight per unit, and a spare on the shelf means one breakdown doesn’t park a truck for weeks. Repair shops and fleet managers can also ask to hear first when a good Duramax LML engine for sale comes in.
Price: What Affects It
- Condition: used, reconditioned or rebuilt
- Fuel system: included, upgraded, or left off
- What’s included: long block or complete engine
- Freight: this is a heavy engine, so destination makes a big difference
Worldwide Shipping on Every Duramax LML Engine for Sale
We ship within North America and worldwide, including Central and South America, the Caribbean, the Middle East, Africa, Asia, Europe, Australia and New Zealand.
- Send your truck details and VIN.
- We confirm the right engine and send photos and a quote.
- You approve and pay.
- We drain, seal and crate the engine on a heavy-duty pallet.
- It ships by truck, sea or air, with tracking.
- You or your agent collect it, after customs if it’s going abroad.
Duties and local fees for international orders are paid at your end. Tell us whether you have a forklift at the receiving end. See our shipping policy for details.
Warranty
Every engine we sell has a warranty against internal mechanical failure, with the terms written on your quote. Damage caused by contaminated fuel from your truck’s existing fuel system isn’t covered, which is why cleaning it matters. Full details are in our refund and returns policy.
Why Buy From NJ Global Auto Parts
- We confirm fitment by VIN before you pay.
- Fuel system checks on every engine.
- Real photos and video of your engine.
- One clear quote with crating and freight.
- Shipping in North America and worldwide.
Frequently Asked Questions
Is the LML a good engine?
Yes. It’s strong and makes excellent torque. The main weak point is the CP4 fuel pump, so fuel quality and filtration matter.
Will an LML fit my 2017 truck?
2017 and later trucks use the L5P, which is a different engine. The LML is for 2011 to 2016 trucks.
Is buying a Duramax LML engine for sale cheaper than rebuilding?
Often, especially when a pump failure has damaged the engine. A rebuild of a diesel V8 takes a lot of parts and time.
Can you supply the Allison transmission too?
Sometimes, from the same donor truck. Ask and we’ll check stock.
Does a Duramax LML engine for sale from you come with injectors?
Most complete units do. We note the condition of the fuel system on your quote, and we can supply the engine without it if you’re fitting an upgraded pump setup.
How do I order?
Use our contact page, call +1 (209) 733-0882, or WhatsApp +1 209 690 5983 with your VIN. We’ll confirm the right Duramax LML engine for sale and send your quote.
Get Your Truck Back to Work
A heavy-duty truck that can’t tow is costing you money every day. A tested LML, fitted with a clean fuel system, gets it back on the job and keeps it there.
Send us your VIN today. We’ll match the right Duramax LML engine for sale, show you the actual engine, and give you a clear price delivered to your door or port.