How to Change the Oil in a 2025 Honda CRF150R

Shop parts for a 2025 Honda CRF150R Dirt Bike.

Changing the oil in your 2025 Honda CRF150R is a crucial maintenance task that will extend engine life, maximize performance, and keep your dirt bike ready for action. The CRF150R features separate compartments for engine oil and transmission oil, so you must change both fluids independently—don’t mix them up. Follow this proprietary MotoSport.com guide for a smooth, professional oil change specific to the 2025 model.

Tools and Supplies Needed

  • Socket set (metric, including 8mm, 10mm, and 12mm sockets)
  • Ratchet or T-handle wrench
  • Oil drain pan
  • Funnel (narrow tip recommended)
  • Clean shop rags or paper towels
  • Oil filter (Honda OEM or compatible replacement)
  • Replacement engine oil (Honda recommends quality 10W-40, 91+ PON for gas; consult your owner's manual for confirmation)
  • Replacement transmission oil (Honda recommends 80W or 85W transmission-specific oil)
  • Torque wrench (for proper bolt specification)
  • O-ring/Gasket set (replace if worn or pinched)
  • Gloves (protect your hands from hot oil and chemicals)

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start your CRF150R and let it idle for 2–3 minutes to warm the oil; this helps it drain more thoroughly.
    • Turn off the engine and let it cool briefly to avoid burns.
  2. Preparation
    • Place your bike on a stable motorcycle stand or the side stand on level ground.
    • Remove the oil fill cap/dipstick and the transmission fill cap to allow air in and help the oil drain out faster.
  3. Locate the Drain Bolts
    • The CRF150R has two separate drain bolts: one for the engine oil, and one for the transmission oil. They are both under the bike but on opposite sides. Do not confuse the two.
    • The engine oil drain bolt is located on the left side, under the engine. The transmission oil drain bolt is on the right.
      Reference your owner’s manual diagram if unsure.
  4. Drain the Engine Oil
    • Place the drain pan under the engine oil drain bolt.
    • Use the correct socket to loosen and remove the engine oil drain bolt. Let the oil drain completely (can take a few minutes).
    • Inspect the drain bolt and washer. Replace the washer if needed to prevent leaks.
  5. Remove and Replace the Oil Filter
    • Remove the oil filter cover bolts with the proper socket.
    • Carefully pull out the oil filter. Inspect for debris or metal fragments (sign of engine wear).
    • Coat the new filter’s O-ring with a bit of fresh oil and install the new filter in the correct orientation. Don’t forget the O-ring—if it’s pinched or damaged, replace it to avoid leaks.
    • Reinstall the oil filter cover and torque the bolts to specification.
  6. Drain the Transmission Oil
    • Place the drain pan under the right side of the bike.
    • Remove the transmission drain bolt and allow all fluid to drain.
    • Inspect the bolt and washer, replacing the washer if necessary.
    • Reinstall and torque the transmission drain bolt properly.
  7. Refill Engine Oil
    • With the drain bolt reinstalled, insert a funnel into the engine oil fill port on the left side of the engine.
    • Pour in the specified quantity of high-quality 10W-40 oil slowly, holding the funnel slightly above the opening to ensure a steady pour and minimize spills .
    • Let the oil settle, then check the level using the dipstick (do not overfill).
    • Reinstall the oil fill cap/dipstick securely.
  8. Refill Transmission Oil
    • Insert the funnel into the transmission oil fill port on the right side.
    • Pour in the recommended quantity of 80W or 85W transmission oil .
    • Check the level to avoid overfilling, then reinstall the fill cap.
  9. Check for Leaks and Test Run
    • Wipe up any spilled oil. Start the engine and let it idle for a few minutes.
    • Shut it off and check under the bike for leaks around the drain bolts and filter cover.
    • Recheck oil levels and top off if needed.
  10. Dispose of Old Oil Properly
    • Never dump used oil down the drain. Take it to a proper recycling facility or auto parts store offering disposal services.

2025 Honda CRF150R Model-Specific Call-Outs

  • Separate Compartments: The engine and transmission use separate drain/fill points and require different oil types/viscosities. Double-check you’re using the right fluid in each.
  • Drain Bolt Location: Newer CRF150R models continue the tradition of two distinct drain bolts. Mistaking one for the other can lead to improper maintenance and possible engine or transmission damage.
  • O-Rings & Gaskets: The CRF150R’s oil filter O-ring can become pinched or degraded easily—always inspect carefully and replace if it shows any signs of damage to avoid leaks and potential engine failure.
  • Torque Specs: Always use a torque wrench set to the manufacturer’s specifications for the drain bolts and oil filter cover to avoid stripping the case threads.
  • Oil Quantity: Refer to your 2025 owner’s manual for exact oil volume, as overfilling or underfilling can cause performance and lubrication issues.
  • Fuel Note: Use pump octane 91 or higher for optimal engine protection and efficiency in your CRF150R.

Final Pro Tips

  • Change oil after every 5–10 hours of riding or after any muddy, sandy, or prolonged riding session for best longevity.
  • Keep meticulous records of maintenance for resale value and performance tracking.
  • Perform a quick visual inspection of both the drained oil and filter for metal shavings—a sign of possible internal wear.

Trust MotoSport.com for all your 2025 CRF150R oil change supplies and expertise. Keeping your Honda in top shape starts with quality maintenance and the right parts—get riding and keep moving forward.

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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.