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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. 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: 122

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

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    MSRP: $16.99 $11.89
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  2. Small Image
    1 quart 10W-40 Full Synthetic Engine Oil | Volvo Penta 21681794
    VOLVO-21681794
    Qty In Stock: 971
    Brand: Volvo Penta
    OEM 21681794 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: $15.90 $15.86
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  3. Indmar Oil 15W40 API Case - 12 QUARTS
    15W-40 Indmar Marine Engine Oil, 1 case of 12 quarts | Indmar 872005
    IND-872005
    Qty In Stock: 3
    Brand: Indmar

    OEM Indmar 15W-40 synthetic blend marine engine oil is recommended for all Indmar 5.7L and 6.0L engines.

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    MSRP: $142.32 $131.11
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  4. Small Image
    25W-40 4-Stroke Marine Engine Oil, 1 quart | Sierra 18-9400-2
    SIERRA-18-9400-2
    Qty In Stock: 185
    Brand: Sierra
    Sierra's Premium Blend engine oil is specially formulated to meet the needs of inboard & stern drive marine engines. Learn More
    MSRP: $14.99 $9.79
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  5. 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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  6. Small Image
    25W-40 Catalyst Marine Engine Oil, 1 quart | Sierra 18-9440CAT-2
    SIERRA-18-9440CAT-2
    Qty In Stock: 133
    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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  7. Small Image
    25W-40 Marine Engine Oil, 1 quart | Sierra 18-9440-2P
    SIERRA-18-9440-2
    Qty In Stock: 112
    Brand: Sierra

    Synthetic blend 25W-40 engine oil formulated for stern drive & inboard marine engines

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    MSRP: $17.89 $10.89
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  8. QS QT Premier Full Synthetic 10W30 oil
    Premier 10W30 Full Synthetic Marine Oil, 1 Quart | Quicksilver 92-8M0175780
    QS-92-8M0175780
    Qty In Stock: 13
    Brand: Quicksilver

    Premier 10W30 Full Synthetic Marine Oil, 1 quart. Not for use with catalyst engines.

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    MSRP: $17.59 $15.99
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  9. Small
    1 quart 25W40 4-Stroke Synthetic Blend Marine Oil | Quicksilver 92-8M0078622
    QS-92-8M0078622
    Qty In Stock: 148
    Brand: Quicksilver

    1 quart 25W40 4-Stroke Synthetic Blend Marine Oil

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    MSRP: $14.29 $12.99
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  10. Sierra 18-9554-2 1 Quart 15W-40 Multi Vehicle Oil
    1 Quart 15W-40 Multi Vehicle Oil | Sierra 18-9554-2
    SIERRA-18-9554-2
    Qty In Stock: 19
    Oil 15W-40 Multi Vehicle Learn More
    MSRP: $10.59 $8.77
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  11. Small Image
    1 quart 10W-30 Gasoline Engine Oil | Volvo Penta 3847302
    VOLVO-3847302
    Qty In Stock: 171
    Brand: Volvo Penta
    OEM Volvo Penta 10W-30 oil is formulated for gasoline marine engines to protect against wear under severe running conditions. Learn More
    MSRP: $14.13 $11.31
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  12. Small
    1 quart 25W40 4-Stroke Marine Oil | Quicksilver 92-8M0078619
    QS-92-8M0078619
    Qty In Stock: 181
    Brand: Quicksilver

    1 quart 25W40 4-Stroke Marine Oil

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    MSRP: $12.09 $10.99
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