Commercial Truck Engines — Used, Rebuilt & Remanufactured Diesel

    Replacement diesel engines for Class 6–8 trucks and heavy equipment. Cummins, Detroit Diesel, Caterpillar, Mack, Volvo, International, John Deere and Perkins — dyno-tested and ready to ship nationwide.

    • Dyno-tested used & remanufactured diesel
    • 6-month warranty standard, extended available
    • Fast nationwide freight to fleets & shops
    • Core exchange credit on most engines

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    When a Class 8 tractor or vocational truck goes down, every day off the road costs money. AutoPartsOcean sources used, rebuilt and remanufactured commercial diesel engines for over-the-road, vocational and off-highway applications — covering the heavy-duty brands fleets and owner-operators depend on most. Instead of paying dealer pricing for a brand-new long block, you can match a quality replacement engine to your truck and get back to hauling for a fraction of the cost.

    We help match the correct engine to your chassis by year, model, displacement and emissions configuration, then arrange freight to your shop, terminal or terminal-to-door. Whether you need a Cummins ISX, a Detroit DD15, a CAT C15, a Mack MP8 or an International DT466, our network of suppliers carries low-mileage takeouts, dyno-tested used units and fully remanufactured engines backed by warranty.

    Diesel Engine Brands We Cover

    AutoPartsOcean specializes in the diesel platforms that move freight and run heavy equipment across North America. Each brand below has its own dedicated page with model-specific detail, specs and fitment notes.

    • Cummins — ISB 6.7, ISC, ISL, ISM, ISX and the current X15
    • Detroit Diesel — Series 60, DD13, DD15 and DD16
    • Caterpillar — C7, C13, C15 and the legendary 3406
    • Mack — E7, MP7 and MP8
    • Volvo Trucks — D11, D13 and D16
    • International / Navistar — DT466, MaxxForce and A26
    • John Deere — PowerTech agricultural and industrial diesel
    • Perkins — industrial, agricultural and generator diesel

    Used, Rebuilt or Remanufactured — Which Should You Buy?

    Used (takeout) engines are complete, running units pulled from low-mileage trucks. They offer the lowest price and fastest availability, and we dyno-test or compression-check units where possible. Rebuilt engines are torn down and have wear components replaced as needed. Remanufactured engines are restored to OEM specification with new bearings, seals, gaskets and reground or replaced internals — the closest thing to new short of buying from the dealer.

    For a high-mileage truck you plan to trade soon, a quality used engine is usually the smart play. For a truck you intend to keep working for years, a remanufactured long block or complete engine delivers the longest service life and the strongest warranty. We will quote all available options so you can weigh price against expected hours of service.

    Long Block vs. Complete Engine & Core Exchange

    A long block includes the block, crankshaft, pistons, cylinder heads and valvetrain, but typically excludes accessories like the turbo, fuel system, manifolds and EGR components — which you transfer from your old engine. A complete (drop-in) engine arrives with most of those accessories installed, reducing labor time. We will confirm exactly what is included before you commit.

    Most remanufactured and many used diesel engines are sold on a core exchange basis: you return your old engine (the core) for credit. Cores must generally be complete and rebuildable. We explain core charges, deadlines and freight up front so there are no surprises on your invoice.

    Warranty, Shipping & Fleet Downtime

    Every engine we supply carries a warranty — typically a 6-month standard term with extended coverage available on remanufactured units. We arrange freight nationwide via commercial carriers, palletized and crated for heavy diesel blocks, with terminal pickup or lift-gate delivery to your location. For fleets fighting downtime, we prioritize in-stock units and expedited shipping so a truck spends less time parked and more time earning.

    Commercial Diesel Platforms at a Glance

    Light/medium dutyCummins ISB 6.7L, John Deere PowerTech, Perkins
    Vocational / Class 6–7International DT466, CAT C7/C13, Cummins ISC/ISL
    Heavy duty / Class 8Cummins ISX/X15, Detroit DD15/DD16, CAT C15, Mack MP8, Volvo D13/D16
    Typical displacement range6.7L to 16.0L inline-6 diesel
    Typical power range~200 to 600 HP / 520 to 2,050 lb-ft
    Common applicationsTractors, dump trucks, mixers, ag & industrial equipment

    We Provide Parts for All Major Vehicles

    1,000+ Vehicles Supported Nationwide

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