How to Change the Oil in a 2022 Honda CRF450RX

Shop parts for a 2022 Honda CRF450RX Dirt Bike.

Changing the oil in your 2022 Honda CRF450RX is crucial for maintaining performance and engine longevity. This guide, proprietary to MotoSport.com, covers the exact steps, the tools and supplies you'll need, and key model-specific tips so you can tackle this maintenance like a pro.

Tools and Parts Needed

  • 8mm and 10mm sockets
  • Socket ratchet
  • Torque wrench (for proper reinstallation torque)
  • OEM or quality oil filter
  • Honda GN4 10W-40 or HP4 20W-50 motor oil (as per your climate and riding style)
  • Honda crush washer (replace at every oil change)
  • Appropriate size O-ring (for filter cover)
  • Measuring cup (for precise oil fill, 1.04 liters required)
  • Drain pan
  • Funnel (narrow tip for fill port)
  • Gloves and rags
  • Parts cleaner
  • Safety glasses

Preparation Steps

  • Warm up the engine for 1-2 minutes to help suspend contaminants and aid oil flow. Shut it off and ensure the bike is on a level surface, preferably using a bike stand.
  • If your bike has a skid plate installed, use the 8mm or 10mm socket to remove it for full access to the drain plug and filter cover.

Step-by-Step Oil Change Instructions

  1. Remove the Oil Filler Cap
    On the left side of the engine, unscrew the oil filler cap to allow air in and help oil drain completely.
  2. Locate and Remove the Drain Plug
    The 2022 CRF450RX uses a 10mm cap drain plug on the bottom of the engine. Place your drain pan underneath and carefully remove the drain plug with the 10mm socket, letting the oil completely drain out.
  3. Remove the Engine Guard or Skid Plate
    If not already removed, this step allows easier access to the oil filter cover.
  4. Replace the Crush Washer
    Always install a new crush washer on the drain bolt to prevent leaks.
  5. Remove the Oil Filter
    Using your socket, unbolt the oil filter cover (left side of the engine). Note the orientation of the filter, the rubber O-ring, and the spring inside–these must be reinstalled properly. Remove the old oil filter.
  6. Clean Components
    Wipe down the filter housing, install a new O-ring if needed, and clean the cap and spring.
  7. Install New Oil Filter
    Insert the new filter into the housing (facing the same way as removed), reinstall the spring in the back of the cap, then bolt the cover back on. Ensure the O-ring has seated properly to avoid leaks.
  8. Reinstall and Torque the Drain Plug
    Once the oil is fully drained, reinstall the drain plug using the new crush washer and torque to the manufacturer's spec (refer to your model's service manual for accuracy).
  9. Add New Oil
    Using a narrow-funnel, add 1.04L (1.1 quarts) of fresh oil through the filler port. Some riders prefer HP4 synthetic oil without moly for smoother clutch action, but Honda GN4 is a solid choice as well.
  10. Check Oil Level
    Wait a minute, then wipe the dipstick and check oil level per the service manual instructions. Adjust as needed.
  11. Reinstall the Filler Cap and Skid Plate
    Securely reinstall the filler cap and, if applicable, your skid plate using the original hardware.
  12. Dispose of Old Oil Responsibly
    Take the used oil and filter to a recycling center. Never pour oil down drains or onto the ground.

Model-Specific Call-Outs for the 2022 Honda CRF450RX

  • The 2022 CRF450RX uses a single oil system (unlike older models that separated engine and transmission oil), so only one drain and one fill point is needed.
  • Oil changes are recommended every 15 hours or 6 races under typical use, but heavy riders or racers might choose more frequent intervals.
  • The oil fill port is relatively small—using a narrow funnel is highly recommended to avoid spills.
  • Always double-check that both the oil filter cap and the drain plug are snug and have new sealing hardware (O-ring and crush washer) to prevent leaks.
  • It's a good habit to briefly run the engine after refilling, then shut it off and re-check the oil level once the oil has circulated.
  • For maximum engine protection, use Honda-recommended oils and OEM-or-better filters to maintain warranty and optimum engine health.

Why Change Your Oil?

  • Your Honda's high-performance engine lives and dies by oil quality. Worn or dirty oil can cause premature engine wear, poor clutch performance, and even catastrophic damage.
  • Regular oil changes flush out damaging dirt, metal, and clutch particles, keeping your CRF450RX running strong and reliable ride after ride.

Wrapping Up

This essential maintenance is quick—usually 10-20 minutes with proper tools and prep. Follow these steps for your 2022 Honda CRF450RX and enjoy worry-free riding and performance on the trail or track.

MotoSport.com recommends consulting your official Honda service manual for precise specs, torque values, and additional maintenance insight specific to your CRF450RX.

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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.