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  1. Shop
  2. Oils & Fluids
  3. 4 Stroke Dirt Bike Engine Oil

4 Stroke Dirt Bike Engine Oil

Every four stroke engine oil in the store on one page: 10W-40 for the Yamaha YZF and WR, Kawasaki and Suzuki, and 10W-50 for KTM, Husqvarna, GasGas and Honda. All of it is motorcycle 4T oil built for a wet clutch and a shared gearbox.

The MWMX oils are full synthetic PAO and ester blends rated API SP and JASO MA2, blended in Australia and sold at a member price that beats the big stores. Motorex, Maxima and Motul sit alongside for riders who run a brand.

Race bikes get fresh oil and a filter every 10 to 15 hours, trail bikes every 20 to 30. 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.

Shop oils & fluids by brand
  • Motorex
  • Maxima
  • Muc-Off
  • Motul
  • Oils & Fluids by type
    • 10W-50 Dirt Bike Engine Oil
    • 10W-40 Dirt Bike Engine Oil
    • 2 Stroke Oil & Premix
    • 4 Stroke Dirt Bike Engine Oil
    • Dirt Bike Chain Lube
    • Air Filter Oil & Cleaner
    • Dirt Bike Coolant
    • Fork Oil & Suspension Fluid
    27 products
    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-40 4L
    SAVE 50%

    MWMX Parts 4T Engine Oil 10W-40 4L

    $119.95
    MWMX Parts 4T Engine Oil 10W-40 1L
    SAVE 50%

    MWMX Parts 4T Engine Oil 10W-40 1L

    $34.95
    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
    Motul 7100 Ester 100% Synthetic 10W-40 Engine Oil 4L
    SAVE 20%

    Motul 7100 Ester 100% Synthetic 10W-40 Engine Oil 4L

    $139.90
    Motorex Cross Power 4T 10W60 - 1L
    SAVE 20%

    Motorex Cross Power 4T 10W60 - 1L

    $47.50
    Motorex Formula 4 Stroke 10W40 4L
    SAVE 20%

    Motorex Formula 4 Stroke 10W40 4L

    $99.95
    Motorex 4 Stroke 20W50 4L
    SAVE 20%

    Motorex 4 Stroke 20W50 4L

    $79.95
    Motorex Racing Pro Cross 10W40 4L
    SAVE 20%

    Motorex Racing Pro Cross 10W40 4L

    $154.95
    Motorex Racing Pro Cross 10W40 1L
    SAVE 20%

    Motorex Racing Pro Cross 10W40 1L

    $39.95
    Motorex Top Speed MC 4T 10W40 4L
    SAVE 20%

    Motorex Top Speed MC 4T 10W40 4L

    $129.95
    Motul Transoil Expert 10W40 4L
    SAVE 20%

    Motul Transoil Expert 10W40 4L

    $99.99
    Maxima Pro Plus 4T 10W40 Syn 3.8L
    SAVE 20%

    Maxima Pro Plus 4T 10W40 Syn 3.8L

    $124.95
    Maxima Pro Plus Syn 4T 10W40 1L
    SAVE 20%

    Maxima Pro Plus Syn 4T 10W40 1L

    $29.95
    Motorex 4 Stroke 10W40 4L
    SAVE 20%

    Motorex 4 Stroke 10W40 4L

    $79.95
    Motorex Gear Oil Sae 10W30 4L
    SAVE 20%

    Motorex Gear Oil Sae 10W30 4L

    $109.95
    Motul 5100 Ester Synth 4T 4L (10W40)
    SAVE 20%

    Motul 5100 Ester Synth 4T 4L (10W40)

    $99.95
    Motul 300V 4T Factory Line 10W40 1L
    SAVE 20%

    Motul 300V 4T Factory Line 10W40 1L

    $45.00
    Motul 300V 10W-40 Full Synthetic Engine Oil - 4L
    SAVE 20%

    Motul 300V 10W-40 Full Synthetic Engine Oil - 4L

    $179.90
    Motul Transoil Expert 10W40 1L
    SAVE 20%

    Motul Transoil Expert 10W40 1L

    $27.90
    Motorex Gear Oil Sae 10W30 1L
    SAVE 20%

    Motorex Gear Oil Sae 10W30 1L

    $29.95
    Motorex Top Speed MC 4T 15W50 4L
    SAVE 20%

    Motorex Top Speed MC 4T 15W50 4L

    $129.95
    Maxima Premium 4 10W-40 1 LT
    SAVE 20%

    Maxima Premium 4 10W-40 1 LT

    $17.50
    Motorex Top Speed MC 4T 15W50 1L
    SAVE 20%

    Motorex Top Speed MC 4T 15W50 1L

    $35.95
    Motul 5100 Ester Synth 4T 1L (10W40)
    SAVE 20%

    Motul 5100 Ester Synth 4T 1L (10W40)

    $29.90

    Questions riders ask

    Yamaha, Kawasaki and Suzuki four strokes list 10W-40. KTM, Husqvarna, GasGas and the Honda CRF450R list 10W-50 or 10W-60. If the manual lists more than one grade, 10W-50 holds up better in Australian heat.

    Car oils carry friction modifiers that make a wet clutch slip, and they are not built for a gearbox running in the same oil. A motorcycle 4T oil rated JASO MA or MA2 is.

    Every 10 to 15 hours on a race bike, every 20 to 30 on a trail bike, and sooner after a wet or sandy ride. Change the filter with it.

    Yes, both MWMX four stroke grades come in 4L, which 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.