How to Change the Oil in a 2021 Honda CRF300L ABS

Shop parts for a 2021 Honda CRF300L ABS Dirt Bike.

Maintaining your 2021 Honda CRF300L ABS with regular oil changes is essential for engine longevity and peak performance. This step-by-step guide is designed specifically for MotoSport.com readers, ensuring you do the job right, whether you're in your garage or at your favorite trailhead.

Tools and Supplies Needed

  • Engine oil: 10W-30 motorcycle oil, meeting JASO MA/SJ or higher (1.4 liters for oil only, 1.5 liters for oil and filter change)
  • New oil filter (Honda OEM strongly recommended)
  • New sealing washer (drain bolt crush washer)
  • New oil filter cover gasket (if needed)
  • 12mm socket and ratchet (drain bolt)
  • 8mm socket (oil filter cover bolts)
  • 4mm Allen key or socket (for skid plate if equipped)
  • Torque wrench
  • Drain pan
  • Rags and gloves
  • Brake cleaner or contact cleaner (optional for cleaning spills)
  • Funnel and measuring cup (for accurate refill)

Preparation

  • Warm up the engine for a few minutes. This helps the oil drain completely and removes more contaminants.
  • Turn off the engine and ensure the bike is secure and stable on a flat surface.

Step-by-Step Oil Change Instructions

  1. Remove the Skid Plate (if installed):
    • Use a 4mm Allen key or the appropriate tool for your model. This exposes the drain bolt and filter cover for easier access.
  2. Drain the Engine Oil:
    • Place the drain pan beneath the drain bolt at the bottom of the engine.
    • Use a 12mm socket and ratchet to loosen and remove the drain bolt.
      Important: Ensure the crush washer comes off with the bolt. Replace with a new washer on assembly.
    • Let the oil fully drain out.
  3. Remove the Oil Filler Cap:
    • This helps the oil drain more quickly and completely.
  4. Replace the Oil Filter:
    • Locate the oil filter cover (right side of engine).
    • Remove the cover bolts with an 8mm socket. Carefully remove the cover and factory spring.
    • Pull out the old oil filter.
    • Specific to this model: When installing the new filter, the "OUT-SIDE" marking (if present) must face outward. If the mark is absent, the rubber seal and central hole face inwards toward the engine. Installing backwards can cause severe engine damage.
    • Place the filter cover spring into the oil filter cover.
    • Install a new oil filter cover gasket if needed.
    • Reinstall the filter cover and tighten the bolts evenly and securely.
  5. Reinstall Drain Bolt:
    • Install new crush washer to the cleaned drain bolt.
    • Lightly coat bolt threads with fresh engine oil for easier removal in the future.
    • Tighten drain bolt to 24 N·m (18 lb·ft) with a torque wrench.
  6. Fill Engine with New Oil:
    • Using a funnel, pour in 1.5 liters (for complete oil/filter change) of 10W-30 JASO MA oil (such as Pro Honda GN4 4-Stroke Oil).
    • Install the oil filler cap.
  7. Check for Leaks and Oil Level:
    • Start the engine and let it run for about one minute. Then shut it off and let oil settle for a few minutes.
    • Check for leaks around the drain bolt and oil filter cover.
    • Verify oil level by inspecting the sight glass or dipstick with the bike upright. The oil should be at or near the upper level mark.
  8. Reinstall Skid Plate:
    • If removed, reinstall the skid plate securely.
  9. Dispose of Oil Properly:
    • Take used engine oil and filters to a recycling center or parts store. Never dispose of oil in drains or nature.

Model-Specific Call-outs for 2021 Honda CRF300L ABS

  • The oil change procedure is identical for CRF300L, CRF300LA (ABS), and CRF300L Rally; the only meaningful differences are in accessories like the skid plate.
  • Oil filter installation is critical: be sure the correct side faces out. Failure to do so risks catastrophic engine damage.
  • Be careful when tightening the small cover bolts; they thread into aluminum and can strip easily if over-torqued.
  • Recommended oil is 10W-30, 1.5 liters with filter replacement. Do not overfill.
  • Oil changes should be performed after the first 600 miles (break-in), then every 8,000 miles, or more often for heavy off-road use.
  • CRF300L's engine is closely related to Honda's CBR250R/CBR300R platform; many general service tips and torque values are interchangeable.

Final Inspection

  • Double-check all bolts for tightness.
  • Monitor oil level and check the drain bolt and filter cover for leaks after your first ride.
  • Ride on with confidence, knowing your Honda is protected by fresh oil.

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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.