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  1. Shop
  2. Oils & Fluids
  3. 10W-50 Dirt Bike Engine Oil

10W-50 Dirt Bike Engine Oil

10W-50 is the grade most modern four stroke race bikes call for: KTM, Husqvarna and GasGas four strokes, the Honda CRF450R and most high revving singles that run the gearbox and clutch in the engine oil.

Every oil on this page is a 4T motorcycle oil, built for a wet clutch and a shared gearbox. Car oil is not, and will slip the clutch. The MWMX 10W-50 is a full synthetic PAO and ester oil rated API SP and JASO MA2, blended in Australia, in 1L and 4L.

Change it every 10 to 15 hours on a race bike and every oil change gets a filter. Members pay the member price on every product in the store and get free standard shipping on orders over $10. Membership is $5 for the first month.

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    • 10W-50 Dirt Bike Engine Oil
    • 10W-40 Dirt Bike Engine Oil
    • 2 Stroke Oil & Premix
    • 4 Stroke Dirt Bike Engine Oil
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    See all 149 oils & fluids →

    Found it cheaper somewhere else online? We’ll beat it for members. Send us the link.

    MWMX Parts 4T Engine Oil 10W-50 4L
    SAVE 50%

    MWMX Parts 4T Engine Oil 10W-50 4L

    $119.95
    MWMX Parts 4T Engine Oil 10W-50 1L
    SAVE 50%

    MWMX Parts 4T Engine Oil 10W-50 1L

    $34.95
    Motorex Cross Power 4T 10W-50 Full Synthetic Engine Oil 1L
    SAVE 20%

    Motorex Cross Power 4T 10W-50 Full Synthetic Engine Oil 1L

    $47.50
    Motorex Cross Power 4T 10W-50 Full Synthetic Engine Oil 4L
    SAVE 20%

    Motorex Cross Power 4T 10W-50 Full Synthetic Engine Oil 4L

    $169.95

    Questions riders ask

    KTM, Husqvarna and GasGas four strokes, the Honda CRF450R and CRF250R, and most four stroke race bikes where the manual lists 10W-50 or 10W-60. Yamaha lists 10W-40 for the YZ250F and YZ450F, so check your manual; if it lists either grade, 10W-50 holds up better in Australian heat.

    Thicker at running temperature, so it holds film strength better in a hot, hard worked engine. Use what the manual lists. Where both are listed, riders in hot climates and hard race use usually go 10W-50.

    No. Car oils carry friction modifiers that make a wet clutch slip. Use a motorcycle 4T oil rated JASO MA or MA2, which every oil on this page is.

    Yes, the 4L bottle is the bulk option and works out well under the 1L price per litre. Members get the member price on both sizes.

    Not sure what fits? Set your bike at the top of the store and every list narrows to parts with confirmed fitment, or message us with your model and year.