Cat C18 Engine For Sale: New, Used & Rebuilt Options
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575–800 HP industrial diesel engine
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Tier 3 and Tier 4 options available
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Ready for industrial and marine use
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Fast shipping across the U.S.
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Financing options available
Check out our CAT Serial Number Prefixes page for C18-specific prefixes (e.g., LBW, MDP, BXS, RGK.)
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Caterpillar C18 Engine Overview
The Cat C18 engine is a high-performance diesel engine built for heavy-duty industrial and marine applications. It delivers strong horsepower, high torque, and reliable operation in demanding environments.
Buyers choose the C18 engine for mining, construction, marine vessels, and power generation due to its durability and service life.
CAT C18 Applications
Oil and Gas Drilling: The CAT C18 is used for a wide variety of applications in oil and gas drilling operations. From powering drilling rigs to mud pumps, the CAT C18 is a high torque output engine with the ability to run continuously under heavy load.
Mining The CAT C18 thrives in harsh mining environments, whether in surface or underground mining. It powers large haul trucks, loaders and auxiliary equipment. Due to it handling extreme duty cycles and high altitudes while delivering streamlined output across long shift cycles, the CAT C18 is the perfect Diesel engine for mining applications.
Construction Heavy construction equipment including large excavators, scrapers, and motor graders rely on the C18 for its power density and durability. It’s built to handle the stop-and-go demands of job sites without sacrificing fuel efficiency or reliability.
Marine Propulsion & Commercial Vessels The C18 is a popular propulsion engine for tugboats, crew boats, ferries, and workboats. With marine-rated configurations reaching up to 1,150 HP, it delivers the thrust needed for demanding waterway operations while meeting marine emissions standards.
Standby & Prime Power Generation The C18 serves as the engine block for many generator sets used in hospitals, data centers, industrial facilities, and remote job sites. It can run in prime power mode for extended periods or switch seamlessly to standby when grid power fails.
Pumping Stations & Compressor Drives Pipeline operators and water authorities use the C18 to drive high-volume pumps and gas compressors. Its steady torque curve at low RPM makes it well-suited for continuous-duty pump applications where consistent flow rates are critical.
We supply new, used, and rebuilt Cat C18 engines with fast turnaround and expert support.
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In-stock engines ready to ship
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Tested and inspected units
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Warranty options available
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Support for installation and setup
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Experienced diesel engine specialists.
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| Specification | Details |
|---|---|
| Engine Model | Cat C18 |
| Displacement | 18.1L |
| Cylinders | 6 Inline |
| Horsepower | 575–800 HP |
| Marine Power | Up to 1150 HP |
| Max Torque | 2736 lb-ft @ 1300 rpm |
| Aspiration | Turbocharged / Twin Turbo |
| Fuel System | Direct Injection |
| Weight | Approx. 3,600–3,900 lbs |
| Emissions | Tier 3 / Tier 4 Final |
Available Cat C18 Engines
We offer multiple configurations:
New Cat C18 Engines
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Tier 4 Final compliant
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Zero-hour engines
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Full manufacturer specs
Used Cat C18 Engines
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Tested and inspected
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Lower upfront cost
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Fast availability
Rebuilt Cat C18 Engines
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Fully overhauled
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New components installed
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Warranty options available
Get Pricing on a Cat C18 Engine Today
Speak with a diesel engine specialist to find the right configuration for your application.
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Large inventory of diesel engines
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Fast nationwide shipping
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Competitive pricing
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Support from experienced technicians
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Help with matching the correct engine
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Frequently Asked Questions About CAT C18 Engines
How much does a CAT C18 engine cost? Pricing on a CAT C18 engine varies depending on condition, configuration, and hours. Used units typically come in at a lower price point, while new and rebuilt engines carry a higher cost due to zero hours and warranty coverage. Marine-rated configurations may also be priced differently than industrial units. Contact our specialists for a fast, accurate quote based on your specific needs.
What is the lifespan of a CAT C18 engine? With proper maintenance, a CAT C18 can last well over 20,000 hours in industrial applications. Many operators report reliable service life beyond that mark when service intervals are followed and quality parts are used. Rebuilt units can essentially reset the clock on engine life when a full overhaul is performed to OEM specs.
What is the difference between a CAT C18 and a CAT C15? The primary difference is displacement and power output. The C15 displaces 15.2 liters and produces up to around 625 HP, while the C18 displaces 18.1 liters and delivers up to 800 HP in industrial applications. The C18 also produces significantly more torque, making it the better choice for high-load applications like large haul trucks, marine vessels, and heavy-duty pumping systems.
Can a CAT C18 be repowered into my existing equipment? In many cases, yes. The C18 is a common repower candidate for equipment originally fitted with older or underpowered engines. Successful repowers depend on mounting dimensions, cooling system compatibility, and ECM integration. Our team can help evaluate your equipment and determine if a C18 repower is a viable option for your application.
Do you offer financing on CAT C18 engines? Yes, financing options are available on CAT C18 engines. We work with buyers to structure payment terms that fit their budget and project timeline. Whether you’re purchasing a single engine or outfitting multiple units, speak with one of our specialists to discuss what financing options may be available for your purchase.
Do you ship CAT C18 engines nationwide? Yes, we ship CAT C18 engines across the United States. Engines are properly crated and prepared for freight to ensure they arrive safely regardless of destination. Lead times vary based on engine condition and configuration. Contact us for estimated shipping timelines and freight details for your location.