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Inboard & I/O Engine Parts

Inboard Marine Engine Parts and Accessories

As the largest online dealer of inboard boat parts, Marine Parts Source will help you find the right engine parts you need for any project. We’re here to assist with seasonal maintenance, major repairs and more so you can get back on the water. Use our convenient categories to browse our collection — or if you know the part number you need, enter it into the search bar. From oil and fuel filters to spark plugs, exhaust manifolds, bell housings, starters and alternator belts, we supply boat owners from coast to coast.

You can always count on quality and knowledge when you shop with us. We’re an authorized dealer of the leading OEM and aftermarket performance inboard marine brands, including J&N Electric, Sierra, Arco Marine, Volvo Penta and Crusader. If you have a question, our sales associates have the technical expertise to answer it. Enjoy free ground shipping on qualifying orders so your vessel is ready for adventure.

Inboard & I/O Engine Parts

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    1 Gallon 10W-40 Full Synthetic Engine Oil | Volvo Penta 21681795
    VOLVO-21681795
    Qty In Stock: 583
    Brand: Volvo Penta
    OEM 21681795 Volvo Penta 10W-40 synthetic oil is formulated for gasoline marine engines to provide maximum protection against wear under severe running conditions. Learn More
    MSRP: $58.40 $44.93
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  2. XPS Marine 5W40 4T Synthenic Blend Oil Gallon BRP | Bombardier Recreational Products 0779435
    XPS Marine 5W40 4T Synthenic Blend Oil Gallon Evinrude/Johnson | Evinrude/Johnson 0779435
    BRP-0779435
    Qty In Stock: 64

    XPS 5W-40 synthetic blend 4-stroke oil is designed for marine engines and contains premium anti-corrosion additives.

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    MSRP: $65.85 $44.60
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  3. Large
    1 Gallon 25W40 4-Stroke Marine Oil | Quicksilver 92-8M0078620
    QS-92-8M0078620
    Qty In Stock: 264
    Brand: Quicksilver

    1 Gallon 25W40 4-Stroke Marine Oil

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    MSRP: $46.19 $41.99
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  4. Volvo Penta 23219274 Motor Oil Gallon Vds-4.5 Sae 15W-40
    VDS-4.5 Diesel Engine Oil SAE 15W-40 - 1 Gallon | Volvo Penta 23219274
    VOLVO-23219274
    Qty In Stock: 716
    Brand: Volvo Penta

    Volvo Penta brand high performance heavy duty VDS-4.5 15W-40 diesel engine oil in a 1 gallon plastic jug.

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    MSRP: $40.00 $37.68
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  5. Large Image
    Full Synthetic 4-Stroke Oil SAE 30 - 5 qt. | Sierra 18-9410-4
    SIERRA-18-9410-4
    Qty In Stock: 79
    Brand: Sierra

    Fully synthetic straight 30-weight engine oil is formulated for Volvo inboard & stern drive marine engines.

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    MSRP: $75.69 $49.25
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  6. XPS Marine 5W40 4T Synthetic Blend Oil 32 oz. BRP | Bombardier Recreational Products 0779434
    XPS Marine 5W40 4T Synthetic Blend Oil 32 oz. Evinrude/Johnson | Evinrude/Johnson 0779434
    BRP-0779434
    Qty In Stock: 58

    XPS 5W-40 synthetic blend 4-stroke oil is designed for marine engines and contains premium anti-corrosion additives.

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    MSRP: $17.67 $12.36
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  7. Sierra 18-9555-4 5W-30 FC-WCAT Semi-Synthetic Engine Oil
    5W-30 FC-WCAT Semi-Synthetic Engine Oil, 5 Quart | Sierra 18-9555-4
    SIERRA-18-9555-4
    Qty In Stock: 5

    5W-30 FC-WCAT Semi-Synthetic Engine Oil, 5 Quart

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    MSRP: $72.99 $44.90
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  8. 1 Quart 4 Stroke Full Synthetic Oil 10W-30 | Sierra 18-9690-2
    1 Quart 4 Stroke Full Synthetic Oil 10W-30 | Sierra 18-9690-2
    SIERRA-18-9690-2
    Qty In Stock: 1
    Brand: Sierra

    Sierra's full synthetic engine oil optimizes engine life by reducing friction while providing wear protection in severe operating conditions. Used with outboard and sterndrive applications.

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    MSRP: $20.79 $15.17
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  9. Small Image
    25W-40 Catalyst Marine Engine Oil, 1 quart | Sierra 18-9400CAT-2
    SIERRA-18-9400CAT-2
    Qty In Stock: 131
    Brand: Sierra

    Premium Blend 25W-40 catalyst engine oil specially formulated to meet the needs of 4-stroke marine engines with catalyst emission systems

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    MSRP: $12.69 $10.81
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  10. Small Image
    10W-30 Catalyst Marine Engine Oil, 1 quart | Sierra 18-9420CAT-2
    SIERRA-18-9420CAT-2
    Qty In Stock: 90
    Brand: Sierra
    Sierra's Premium Blend 10W-30 catalyst engine oil is specially formulated to meet the needs of 4-stroke outboards with catalyst emission systems. Learn More
    MSRP: $10.49 $8.65
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  11. Small
    25W40 4-Stroke Synthetic Blend Marine Oil | Quicksilver 92-8M0078623
    QS-92-8M0078623
    Qty In Stock: 243
    Brand: Quicksilver

    1 gallon 25W40 4-Stroke Synthetic Blend Marine Oil

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    MSRP: $46.19 $41.99
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  12. Small Image
    25W-40 Catalyst Marine Engine Oil, 1 quart | Sierra 18-9440CAT-2
    SIERRA-18-9440CAT-2
    Qty In Stock: 129
    Brand: Sierra
    Synthetic blend 25W-40 engine oil is formulated for stern drive & inboard marine engines with catalyst emission systems. Learn More
    MSRP: $16.49 $9.99
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