Renowned for its durability and performance, the Caterpillar C15 engine is highly sought after across multiple industries. The C15 Engine for sale at Vaz Auto Solutions is a powerful Class 8 truck diesel with proven reliability. Though used, this motor is the perfect solution for your over-the-road trucking, vocational, and commercial needs.
The Caterpillar C15 engine is a powerhouse, delivering exceptional performance in heavy-duty applications. From Class 8 trucks to industrial machinery, the C15 engine for sale is designed to meet the rigorous demands of various operational environments.
The C15 was offered in two main generations across its production life:
| Option | Description |
|---|---|
| Pre-ACERT C15 (6NZ Series, 1999 to 2003) | The original C15, replacing the 3406E in 1999. Beloved by owner-operators for its raw simplicity, mechanical-feel character, and exceptional tunability. The 6NZ designation refers to the engine serial number prefix. The pre-ACERT C15 has no EGR (Exhaust Gas Recirculation), making it a favorite among performance-tuning shops because it can support 800+ hp with appropriate tuning and supporting modifications. |
| ACERT C15 (MXS, SDP, 6TZ Series, 2004 to 2007) | The C15 with ACERT technology (Advanced Combustion Emission Reduction Technologies), Caterpillar's solution to meeting EPA 2004-2007 emissions regulations. ACERT introduced Variable Valve Actuation (VVA) and Exhaust Gas Recirculation (EGR). The MXS, SDP, and 6TZ engine serial number prefixes designate sub-variants with progressively updated emissions controls. ACERT engines are more emissions-compliant but more complex to service. |
After 2007, Caterpillar exited the on-highway truck engine market in North America, making the late ACERT C15 variants the last "Cat Truck Engine" available new (until the modern CT-15 / Cat Industrial C15 platform). This historical position adds collector and restoration value to documented C15 cores.
We offer several models of the C15 Cat engine for sale, including pre-ACERT 6NZ and ACERT (MXS, SDP, 6TZ) variants. These engines are available in various configurations to ensure they meet your particular requirements. Tell us your truck year, donor truck (Freightliner Classic XL, Kenworth T800, Peterbilt 389, etc.), and ECM compatibility requirements, and we'll match the appropriate variant.
Our inventory includes high-quality, thoroughly inspected used C15 engines for sale. Each engine undergoes rigorous testing to ensure it meets our stringent standards for performance and reliability. We pride ourselves on providing engines that are not only affordable but also dependable.
Here at Vaz Auto Solutions, you'll find the best quality used C15 engine for sale at a very reasonable price.
| Item | Details |
|---|---|
| INCLUDED | Long block: cast iron block, forged crankshaft, connecting rods, pistons, camshaft, cylinder heads, valve train, MEUI injectors (typical), turbocharger (typical), oil pan, valve covers. |
| NOT INCLUDED | ECM (sold separately, application-specific to truck chassis and ECM serial number requirements), wiring harness, intake manifold (typical), exhaust manifold (typical), starter, alternator, A/C compressor, water pump, thermostat, oil cooler, transmission, motor mounts. |
| Fluids | Drained before shipping. Refill with Cat-approved engine oil meeting ECF-3 spec or higher (15W-40 mineral or synthetic per Cat operating manual). |
| Provenance Note | Donor truck application disclosed where available. ECM serial number documented for buyer's Cat ET / Cat Connect compatibility verification. |
| Core Note | No core charge. You are not required to return your old engine. |
The Caterpillar C15 was used in the following Class 8 truck applications:
| Vehicle | Compatibility |
|---|---|
| Freightliner Classic XL | The classic owner-operator C15 application |
| Freightliner Coronado | Cat C15 was a popular engine option |
| Freightliner Columbia | Cat C15 option (with the 3406E predecessor in earlier years) |
| Kenworth T800 | Cat C15 was the premium engine option |
| Kenworth W900 | Cat C15 was the premium engine option for the iconic long-hood |
| Peterbilt 379 | Cat C15 was the premium owner-operator engine option |
| Peterbilt 389 | Cat C15 was the premium engine option for the modern long-hood |
| Peterbilt 365 | Cat C15 vocational option |
| Mack Trucks | Caterpillar engine option in Mack chassis |
| International Trucks | Cat C15 engine option in International heavy-duty trucks |
| Western Star 4900 | Cat C15 was a popular engine option |
| Western Star 5900 | Cat C15 was a popular engine option |
Industrial / marine / mining variants exist with different ECM calibrations. Tell us your application and we'll match the appropriate C15.
Every used Caterpillar C15 we ship goes through this process:
| Aspiration | Turbocharged with air-to-air aftercooler |
|---|---|
| Bore X Stroke | 5.4 in x 6.75 in |
| Compression Ratio | 16.0:1 |
| Configuration | Inline-6 |
| Cooling System | Liquid cooled |
| Fuel System | MEUI (Mechanically Actuated | Electronically Controlled Unit Injection) |
| Intake | Turbocharged with intercooler / aftercooler |
| Operating Speed | 1 | 800 to 2 | 100 rpm |
| Power Ratings | 354 to 433 bkW |
| Valvetrain | OHV | 4 valves per cylinder |
| Horsepower | 435 to 625 hp |
| Torque | 2 | 050 lb-ft |
| Displacement | 15.2 liters (928 cubic inches) |
| Weight | 3 | 090 lbs |
| Block Material | Cast Iron |
| Head Material | Aluminum |
| Acert Technology | Yes (on 2004-2007 MXS / SDP / 6TZ variants) |
| Egr | Yes (on ACERT variants only) |
| Vva | Yes (on ACERT variants only) |
Purchased a C15 Cat Engine from Vaz Auto Solutions for our Freightliner Classic XL. The engine arrived quickly and in good condition. Installation was a breeze, and since then, it's been performing like a champ. It's responsive, reliable, and has improved our truck's overall performance. So far, no complaints – it's exactly what we needed to keep our operations running smoothly
Got the C15 Cat Engine from Vaz Auto Solutions to replace my old one in the Kenworth T800. Installation was straightforward, and the engine fired up without any issues. It's been running strong, providing excellent power for hauling heavy loads over long distances. Fuel efficiency seems solid too, which is a relief for my bottom line. Overall, a solid purchase and smooth transaction with Vaz Auto Solutions.
Every used Caterpillar C15 engine sold by Vaz Auto Solutions is covered by a 15 day replacement warranty from the date of delivery.
To file a claim, contact us within 15 days of delivery at (240) 301-0095 or support@vazautosolutions.com.
