5.9 Cummins Engine for Sale: The Ultimate Buyer’s Guide

If you’re on the hunt for a 5.9 Cummins engine for sale, you’re in the right place. Whether you’re upgrading your diesel pickup, replacing a blown engine, or restoring a project truck, the legendary 5.9L Cummins diesel engine continues to be a top choice for diesel enthusiasts and mechanics alike. Known for its durability, torque, and simple design, the 5.9 Cummins has earned a cult following since its introduction in the late 1980s.

In this article, we’ll explore everything you need to know before purchasing a 5.9 Cummins engine, including:

• What makes the 5.9 Cummins engine special

• Versions and generations (12-valve vs. 24-valve)

• Performance specs and towing capacity

• Where to find a 5.9 Cummins engine for sale

• Used vs. remanufactured vs. crate engines

• Prices and warranty information

• Common questions and maintenance tips

Let’s dive in.

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What Is the 5.9 Cummins Engine?

The 5.9 Cummins is a 5.9-liter inline-six diesel engine developed by Cummins Inc., commonly found in Dodge Ram trucks between 1989 and 2007. The engine was designed to offer commercial-grade reliability and high torque output, making it ideal for heavy-duty pickups, industrial machinery, and even boats and generators.

This turbocharged diesel engine helped put Dodge back on the map in the truck segment, competing with Ford Power Stroke and GM Duramax engines.

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Why Is the 5.9 Cummins Engine So Popular?

Here’s why diesel enthusiasts love the 5.9L Cummins:

• Legendary Reliability: Known to run over 500,000 miles with proper maintenance

• Solid Construction: Cast-iron block, forged-steel connecting rods, and simple mechanical components

• Fuel Efficiency: More economical than many modern V8s

• High Torque: Ideal for towing, hauling, and off-roading

• Tuning Potential: Responds well to performance mods and tuning upgrades

• Low Maintenance: Easier to service than newer, computer-controlled engines

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Generations of the 5.9 Cummins Engine

There are two primary versions of the 5.9 Cummins:

1. 12-Valve (1989–1998)

• Model: 6BT

• Mechanical injection pump (Bosch VE or Bosch P7100 “P-Pump”)

• 12 valves (2 per cylinder)

• Power: 160–215 hp

• Torque: 400–440 lb-ft

• Simpler, fully mechanical—ideal for swaps and off-grid use

• Most sought-after model for reliability and tunability

2. 24-Valve (1998.5–2007)

• Model: ISB (Interact System B)

• Electronic fuel injection (VP44 and later, Bosch Common Rail)

• 24 valves (4 per cylinder)

• Power: 215–325 hp

• Torque: 460–610 lb-ft

• Better emissions compliance and improved refinement

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Performance Specs by Year (Quick Reference)

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Where Can You Find a 5.9 Cummins Engine for Sale?

You have several options when shopping for a 5.9 Cummins engine:

1. Online Marketplaces

• eBay Motors

• Craigslist / Facebook Marketplace

• Car-Part.com (Salvage Yards)

• Diesel forums and classified sites like CumminsForum or DieselTruckResource

2. Remanufacturers & Diesel Engine Dealers

• Jasper Engines

• Powertrain Products Inc.

• Reviva Diesel

• Industrial Injection

• BD Diesel Performance

3. Local Salvage Yards

You might find complete donor trucks or engine-only listings. Check compatibility before buying.

4. Truck Rebuilders & Swap Shops

Some businesses specialize in Cummins engine swaps and may sell fully rebuilt or performance-modified units.

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Used vs. Remanufactured vs. Crate Engines

✅ Used Engines

• Cheapest option

• Risk of hidden issues or poor maintenance

• Usually no warranty

✅ Remanufactured Engines

• Professionally rebuilt to OEM specs

• Includes new or reconditioned parts

• Warranties from 1–3 years

• Costs more, but worth it for peace of mind

✅ Crate Engines (New or Performance Builds)

• Brand-new or custom-built with high-performance internals

• Ideal for performance builds or show trucks

• Most expensive

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How Much Does a 5.9 Cummins Engine Cost?

Here’s a breakdown of price ranges:

⚠️ Prices may vary based on model year, condition, warranty, and included accessories (turbo, injectors, ECM, etc.).

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Important Questions to Ask Before Buying

1. Is it a 12-valve or 24-valve engine?

2. What’s the mileage or hours on the engine?

3. Has it been rebuilt or modified?

4. Does it include accessories (turbo, ECM, harness, etc.)?

5. Was it tested for compression and leaks?

6. Is there a warranty?

7. What’s the return policy or buyer protection?

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Popular 5.9 Cummins Engine Applications

Besides Dodge Ram pickups, the 5.9L Cummins can be found in or swapped into:

• School buses

• Step vans

• Industrial equipment (generators, tractors)

• Classic trucks (Ford, Chevy, International)

• Off-road or overland rigs

Its versatility and simplicity make it perfect for engine swaps in custom projects.

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Tips for First-Time Buyers

• Verify VIN compatibility with your truck model

• Check for matching ECU and wiring harness if doing a swap

• Avoid rusted-out cores or engines that sat too long without running

• Look for rebuild documentation or dyno sheets

• Buy from trusted sellers with reviews or warranty coverage

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Best Mods for the 5.9 Cummins

Once you get your 5.9 Cummins engine, here are top mods to boost performance:

• Upgraded Turbo (BorgWarner, Holset)

• High-Flow Injectors

• Fuel Pump Upgrade (FASS or AirDog)

• Cold Air Intake & Intercooler

• Performance Tuner (EFI Live, Edge, Smarty)

• Exhaust Brake for towing control

• ARP Head Studs for high-boost builds

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Routine Maintenance Checklist

To keep your 5.9 Cummins running strong for years:

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5.9 Cummins vs. 6.7 Cummins: Which One Should You Choose?

Verdict: For DIYers and engine swaps, the 5.9 Cummins is the better pick. For modern trucks with warranty and towing needs, the 6.7L Cummins delivers more refined power.