How to Change the Oil in a 2024 Honda CRF150R

Shop parts for a 2024 Honda CRF150R Dirt Bike.

Routine oil changes are essential for maintaining the performance and reliability of your 2024 Honda CRF150R. This guide, proprietary to MotoSport.com, provides everything you need to know to change both the engine oil and the transmission oil, with model-specific tips to ensure the job is done right.

Tools and Supplies Needed

  • 10mm and 8mm sockets/wrenches
  • Socket wrench
  • Oil drain pan
  • Measuring cup (milliliter markings)
  • Funnel
  • Replacement crush washers for drain bolts
  • Clean shop rags
  • Honda GN4 10W-40 4-stroke engine oil or equivalent
  • Oil filter (if changing)
  • Replacement O-rings (if necessary)

Preparation

  • Run the bike for a few minutes to warm the oil for better flow.
  • Turn off the engine and place the bike on a stable, level surface using a stand.
  • Have all your tools and supplies ready.

Steps to Change Engine Oil

  1. Remove the Engine Drain Bolt
    • Locate the engine oil drain bolt underneath the right side of the engine.
    • Use a 10mm wrench or socket to remove the bolt. Make sure an oil drain pan is positioned to catch used oil.
    • Allow oil to fully drain. Inspect and replace the crush washer if damaged or worn.
  2. Replace Engine Oil Filter (if applicable)
    • Use the socket wrench to remove the oil filter cover.
    • Remove the old filter and O-ring (if equipped), replace with a new filter and O-ring.
    • Reinstall the oil filter cover, ensuring it is snug but not over-tightened.
  3. Reinstall Engine Drain Bolt
    • Install new crush washer if needed.
    • Screw in the drain bolt by hand to avoid cross-threading, then torque snugly with the wrench.
  4. Add Engine Oil
    • Remove the engine oil fill cap/dipstick.
    • Use a funnel and measuring cup to pour in 590 ml (if replacing the oil filter) or 560 ml (if not replacing the filter) of Honda GN4 10W-40 or equivalent oil

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    • Reinstall the fill cap.

Steps to Change Transmission Oil

  1. Remove Transmission Drain Bolt
    • The transmission oil drain bolt is generally found on the opposite side of the engine.
    • Remove the 8mm bolt and let fluid drain completely into the oil pan.
    • Replace the crush washer if needed.
  2. Reinstall Transmission Drain Bolt
    • Hand thread the drain bolt and snug with a wrench. Do not overtighten.
  3. Add Transmission Oil
    • Remove the transmission oil fill bolt, usually located on the side of the engine casing.
    • Pour 580 ml of engine oil (use the same Honda GN4 10W-40 if preferred, as specified for both sides in the CRF150R) into the transmission—pour slowly to prevent overflow

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    • Reinstall the fill bolt when finished.

Final Steps

  • Start the engine and let it run for a few minutes. Then shut off and let the oil settle.
  • Check the engine oil level using the dipstick. Add oil as needed to reach the correct level.
  • Check for leaks at all drain and fill points. Inspect for any drips around the bolts or filter cover. Tighten as necessary, being careful not to overtighten and strip the bolts

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Specific Call-Outs for the 2024 Honda CRF150R

  • The CRF150R uses separate engine and transmission oil compartments. Be sure to service both sides during an oil change for full engine protection

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  • If changing oil only (not the filter), reduce the engine compartment oil from 590ml to 560ml.
  • Only use motorcycle-specific oil; automotive oil can cause clutch and lubrication issues

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  • The recommended Honda GN4 10W-40 works for both the engine and transmission sides for this model year

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  • Always replace crush washers to prevent leaks after oil changes

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  • Ensure that the O-rings on the filter cover and the fill caps are intact and not cracked or compressed

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  • Carefully hand-thread bolts to avoid cross-threading in the aluminum engine cases.

Important Safety and Maintenance Notes

  • Dispose of used oil responsibly—recycle at an approved facility.
  • Wipe up any spilled oil to prevent slipping hazards and protect bike components.
  • Consult your owner’s manual for regular maintenance intervals and additional service tips

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.