How to Change the Oil in a 2015 Honda CRF125F — MotoSport.com Exclusive Guide

Shop parts for a 2015 Honda CRF125F Dirt Bike.

Performing routine oil changes is one of the most important maintenance tasks for ensuring the long, healthy life of your 2015 Honda CRF125F. This easy DIY project takes less than 30 minutes and requires a few basic tools. Follow this robust, step-by-step guide tailored to this specific model, with MotoSport.com’s proprietary expertise to keep your CRF125F performing at its peak.

Tools & Supplies Needed

  • Honda GN4 10W-30 or 10W-40 motorcycle oil (at least 1 quart/liter; capacity is 0.9 quart or 850 mL)
  • 17mm socket and ratchet (deep well or with extension for better access)
  • Oil drain pan
  • Narrow funnel (for easy filling)
  • New crush washer for drain plug (recommended)
  • Clean rags or paper towels
  • Torque wrench (optional but best practice)
  • Gloves (to keep your hands clean)

2015 Honda CRF125F Oil Change Procedure

  1. Warm up the engine.
    • Start the bike and let it idle for about 3-4 minutes. This warms the oil so it drains more completely and quickly.
  2. Stabilize and secure the bike.
    • Place the bike on a stand or have someone hold it upright for stability. Keeping it level ensures a full drain and accurate oil measurement.
  3. Locate the oil drain plug.
    • The 17mm drain plug is on the bottom center of the engine case, accessible through a notch in the skid plate.
  4. Place the drain pan under the engine.
  5. Remove the drain plug.
    • Use the 17mm socket to loosen and remove the drain bolt. Allow all the oil to drain fully (takes 5-10 minutes).
    • Check that the crush washer comes off with the bolt. Replace it with a new washer if possible to prevent leaks.
  6. Reinstall the drain plug with crush washer.
    • Screw in the drain plug by hand first, then snug it up using your ratchet.
    • If using a torque wrench, tighten to 18 foot-pounds (216 inch-pounds) to avoid overtightening and potential damage.
  7. Refill the engine with fresh oil.
    • Remove the oil fill cap/dipstick on the right side of the engine.
    • Insert a funnel and add 0.9 quart (850 mL) of motorcycle-specific oil. Do not exceed capacity.
  8. Check oil level (very important for CRF125F).
    • With the bike upright and level, do not screw in the dipstick when checking oil level. Instead, insert the clean dipstick until it contacts the threads, then remove and confirm the oil is between the marks.
    • Add oil in small increments if needed to reach the proper level.
  9. Run the engine and recheck oil:
    • Start the bike and let it idle for 3-5 minutes, then turn it off and wait a couple minutes for oil to settle.
    • Re-check the oil level as above; top off as needed.
  10. Clean up and dispose of used oil properly.
    • Recycle used oil at a local auto parts store or recycling center.

Model-Specific Tips & Critical Call-Outs for 2015 CRF125F

  • No Oil Filter: CRF125F models do not have an oil filter, so frequent oil changes (every 10 hours of riding or as specified in your owner’s manual) are vital for engine health and longevity. Skipping oil changes will rapidly accelerate engine wear.
  • Crush Washer Replacement: Always check and replace the drain plug’s crush washer to prevent leaks. This simple step avoids future headaches.
  • Dipstick Check Method: Never thread the dipstick into the case when checking oil level on this engine. Insert only until it touches the case, then read. Screwing it in gives a false, low reading—overfilling risks excessive crankcase pressure and leaks.
  • Torque Values: Stick to 18 ft-lbs for the drain plug. Avoid over-tightening—this can strip the aluminum threads.
  • Oil Quantity: The correct capacity is 0.9 quart (approximately 850 mL). Over-filling can cause engine issues. Under-filling risks engine damage.
  • Oil Quality: Only use motorcycle-specific oil (JASO MA/MA2-rated) like Honda GN4, Motul, or other top brands in 10W-30 or 10W-40 weights to prevent clutch and transmission slippage.

Frequently Asked Questions

  • How often should I change the oil?
    Recommended every 10 riding hours or after every few rides for aggressive trail/track use.
  • Can I use automotive oil?
    No. Only use motorcycle-rated oil. Automotive oils lack the friction modifiers needed for your bike’s wet clutch system.
  • What if I lose or damage the drain plug/crush washer?
    Replace them with OEM Honda parts. Cheap replacements can cause leaks or improper sealing.

With these steps, your 2015 Honda CRF125F will be ready for adventure, with fresh oil protecting every moving part. For top-quality motorcycle oils and engine maintenance products, shop MotoSport.com—your trusted source for all things dirt bike.

Always consult your bike’s OEM user manual for guidance and any year-specific changes Honda may introduce.

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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.