How to Change the Oil in a 2018 Honda CRF250R: The Complete MotoSport.com Guide

Shop parts for a 2018 Honda CRF250R Dirt Bike.

Routine oil changes are vital for the peak performance and longevity of your 2018 Honda CRF250R. This step-by-step guide ensures you do the job right, keeps you safe, and helps protect your investment. All information is proprietary for MotoSport.com customers and tailored specifically for the 2018 model year.

Tools & Supplies You'll Need

  • Socket wrench or T-handle (preferably 8 mm and 6 mm sizes) for bolts
  • Drain pan for collecting used oil
  • Replacement oil filter (KN116 or equivalent for most brands)
  • Replacement engine oil (SAE 10W-40, Honda GN4 or Yamalube, synthetic/standard acceptable)
  • New sealing washer for drain bolt (recommended)
  • Torque wrench (for tightening drain bolt and filter housing correctly)
  • Shop towels/paper towels for cleanup
  • Funnel for clean oil filling
  • Gloves and safety goggles

Preparing Your CRF250R

  • Warm up your motorcycle for 3–5 minutes to help oil fluidity, but don’t let it get hot. Shut off the engine and confirm it’s in a stable, upright position, ideally on a stand.
  • Have all your tools and materials within reach to limit messes and downtime.

Step-By-Step Oil Change Procedure

  1. Locate the components:
    • The oil drain plug is on the bottom of the crankcase. The oil fill cap is on the right-hand side, and the oil filter cover is also easily accessible on the case’s right side.
  2. Remove the Fill Cap:
    • Take off the oil fill cap to allow air flow and aid draining.
  3. Drain the Old Oil:
    • Place your drain pan under the drain plug.
    • Remove the drain bolt and let the oil flow out completely. Inspect and replace the sealing washer if needed.
  4. Replace the Oil Filter:
    • Remove the oil filter cover (usually three small bolts).
    • Take out the old oil filter, spring, and gasket. Note the direction the filter goes in—incorrect orientation can lead to oil starvation.
    • Wipe mating surfaces clean with a towel.
    • Install the new filter, spring, and a fresh gasket.
    • Reinstall the cover, tightening bolts evenly and according to manufacturer torque specs.
  5. Reinstall the Drain Bolt:
    • Fit a new sealing washer if possible. Tighten to the manufacturer’s torque specification.
  6. Refill with Oil:
    • Use a funnel and fill with 10W-40 motorcycle oil until it's at the recommended amount. The CRF250R takes approximately 0.8 to 1.0 liters (see your owner’s manual for specifics).
    • Don’t overfill–stop once oil begins to pour out of the oil level check hole if equipped, or reach the dipstick/full mark.
  7. Re-check Oil Level:
    • Reinstall the oil fill cap, then start the bike and let it idle for –2 minutes (do not rev).
    • Shut off the engine, let the bike sit for 2 minutes, and re-check the oil level. Add oil if needed.

Special Notes for the 2018 CRF250R

  • Your CRF250R uses a unified engine/transmission oil system (unlike X models which use split oil compartments).
  • Always verify oil level by the manufacturer’s procedure—overfilling can cause power loss or oil blow-by, while under-filling leads to engine damage.
  • Ensure that the correct orientation is observed when fitting the oil filter; improper installation is a common error and may cause oil starvation or engine failure.
  • The correct filter size is commonly listed as KN116 but always confirm compatibility before installation.
  • Running the engine after an oil change will circulate oil and may lower the visible oil level—always re-check after warm-up.
  • If your bike is raced or exposed to extreme dirt, Honda recommends changing oil more frequently than service intervals specified for trail use.

Disposal & Final Check

  • Always dispose of old oil and filters responsibly, in accordance with local regulations.
  • Review that drain plugs, filter covers, and fill caps are all secure before riding.

Common Problems and Tips

  • If you see oil leaking post-service, first check for proper torque and for any old O-rings or washers accidentally re-used.
  • Consult your owner’s manual for specific oil quantities and torque values whenever possible. If misplaced, you can often find these online or from your MotoSport.com resources.

Summary

Changing the oil on your 2018 Honda CRF250R is simple with the right tools and a careful approach. Following these steps will ensure peak performance and a longer life for your bike.

Related Shopping Categories

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Shop Oil Fillers and Drain Plugs for a 2018 Honda CRF250R Dirt Bike.

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.