Cummins QSL/QSL 9

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About This Cummins QSL/QSL 9

The Cummins QSL/QSL 9 is based on the 8.3L ISC platform but features increased displacement, bringing it to 8.9L. Cummins developed the QSL/QSL 9 to replace the L10, delivering improved efficiency, better packageability, and enhanced durability. While the QSL/QSL 9 shares the same cast-iron block and 24-valve cylinder head design as the ISC, it achieves greater displacement through a longer stroke—resulting in increased cubic inches and overall performance. More displacement translates to increased torque and pulling power, making the QSL/QSL 9 better suited for demanding applications. Combined with its proven platform and improved efficiency, this results in strong performance, dependable reliability, and longer service life in real-world operating conditions.
Common Equipment Powered by the Cummins QSL/QSL 9

The Cummins QSL/QSL 9 is commonly found in Class 6-8 trucks, motorhomes, transit buses, fire trucks, refuse trucks

Why Buy From Pilot Engines?

Built to Exact VIN/ESN

Every engine is remanufactured to your exact engine serial number - guaranteed fit, every time.

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Trusted by fleet managers and owner-operators nationwide for quality and reliability.

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Ground LTL and UPS freight included within the continental U.S. - both ways.

Price Match Guarantee

We match like-for-like price quotes from competitors. Quality at the best price.

8-Hour Installation

Exact serial number match means your engine drops in and installs in about 8 hours.

OEM-Quality Performance

Remanufactured engines deliver OEM performance at a fraction of the cost of new.

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why pilot engines

The Smart Choice for Engines

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Built to Exact VIN/ESN

Every engine is remanufactured to your exact engine serial number — guaranteed fit, every time.

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Highly Rated

Trusted by fleet managers and owner-operators nationwide for quality and reliability.

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Free Shipping

Ground LTL and UPS freight included within the continental US — both ways.

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Price Match Guarantee

We match like-for-like price quotes from competitors. Quality at the best price.

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8-Hour Installation

Exact serial number match means your engine drops in and installs in about 8 hours.

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OEM-Quality Performance

Remanufactured engines deliver OEM performance at a fraction of new engine cost.

The Smart Way to Buy

From inquiry to installation — a straightforward process.

  1. Tell Us Your Needs

    Share your vehicle or  equipment details

  2. We Match the Right Fit

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  3. Competitive Quotes

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  4. Fast Delivery & Support

    Freight included, shipped nationwide

  5. Back on the Road

    Quality  backed by warranty

Frequently asked questions

How long will this engine last?

With proper maintenance, remanufactured engines routinely exceed 300,000 to 500,000 miles

What are common failure points?

Like most diesel engines, EGR and emissions components, injectors and turbo systems over time.

Is this enough power for my application?

If you're not hauling extreme loads daily, the ISL provides the best balance you'll feel mile for mile.

New vs Reman — what should I choose?

Remanufactured offers OEM-level quality, tested performance and the best value versus buying new.