How to Change the Oil in a 2008 Honda CRF250R

Shop parts for a 2008 Honda CRF250R Dirt Bike.

Keeping the oil fresh in your 2008 Honda CRF250R is crucial for top performance and longevity. This dirt bike features a separate engine oil and transmission oil system, so you'll need to address both. The process is straightforward but demands attention to model-specific details. Below is a proprietary oil change guide for MotoSport.com, focused specifically on the 2008 CRF250R.

Tools & Materials Needed

  • Socket set (includes 8mm, 10mm sizes common for this bike)
  • T-handle wrench or ratchet
  • Oil drain pan
  • Funnel
  • Clean shop rags
  • Replacement crush washers (for drain bolts, highly recommended)
  • OEM recommended engine oil (see manual for spec, typically 10W-40 or similar for motocross use)
  • Transmission/gearbox oil (as specified by Honda)
  • New oil filter (optional, but best practice)
  • Torque wrench
  • Screwdriver (for oil filter cover, if changing filter)
  • Gloves
  • Service stand (to keep the bike upright and level)

Specific 2008 Honda CRF250R Oil Change Guidance

  • This model uses separate cavities for engine and transmission oil–both must be changed independently for proper function and longevity.
    Note: Filling both sides with engine oil or mixing oils can damage the engine and gearbox.
  • The engine oil capacity is approximately 0.72L when changing oil only, or 0.73L when changing oil and filter. Always verify with your owner's manual for exact quantity.
  • Do not overfill either side—level must be checked with the bike upright and on level ground.
    For the engine side, always use the dipstick per Honda's procedure. For transmission, use the inspection bolt.
  • Crush washers on both drain plugs should be replaced every oil change.

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start your CRF250R and let it idle for 3 minutes to thin the oil. Turn it off and let it sit for a minute to avoid burns.
      This ensures more contaminants are removed when draining the oil.
  2. Set the Bike Upright
    • Place the bike on a stand or make sure it's upright and level.
  3. Remove the Fill Plugs
    • Loosen the engine oil fill cap/dipstick and the transmission fill plug before draining (prevents airlock).
  4. Drain the Engine Oil
    • Locate the engine oil drain bolt beneath the engine (NOT the transmission side).
    • Place a drain pan underneath, then remove the bolt using the socket and wrench. Allow all dirty oil to fully drain.
    • Inspect the used oil for metal shavings–signs of excessive wear.
    • Replace the crush washer and reinstall the drain bolt. Torque to factory specification (commonly 12–14 ft-lb).
  5. Drain the Transmission Oil
    • Locate the transmission drain bolt–on the opposite side, underneath, near the shift lever.
    • Remove drain bolt and crush washer. Drain fully and inspect for wear debris.
    • Install new crush washer and reinstall bolt; torque to spec.
  6. Change Oil Filter (Recommended)
    • Remove oil filter cover (next to engine oil fill). Pay attention to oil dripping–have a rag handy.
    • Remove old filter and O-ring. Clean gasket surfaces. Insert new filter as marked (“OUTSIDE” faces out), lubricate new O-ring, and reinstall cover. Torque bolts to spec.
    • Dispose of the old filter responsibly.
  7. Add New Engine Oil
    • Pour recommended amount of oil slowly through the engine oil fill using a funnel.
    • Insert dipstick but do not screw in to check level.
    • Top off so level is between lower and upper dipstick marks. Do not overfill.
  8. Add New Transmission Oil
    • Pour specified transmission oil into the trans fill port. Fill until oil just begins to seep out the check bolt opening (level surface is critical).
    • Reinstall fill plug and check bolt.
  9. Final Steps
    • Wipe off any spills. Reinstall skid plate if removed.
    • Start engine. Let it idle for 2–3 minutes. Check for leaks at all plug and filter points.
    • Turn engine off, let oil settle one minute, then re-check all fluid levels and top off as needed.

Owner-Specific Call-Outs for the 2008 Honda CRF250R

  • Never use car oil – use only motorcycle-specific oil formulated for wet clutches and high RPM aerospace tolerances.
  • Take care that the engine and transmission oils are not mixed up—double-check fill ports and capacities.
  • Check and replace O-rings and crush washers every time—this prevents leaks.
  • If you ride in sand, mud, or race conditions, decrease your oil change intervals for maximum engine life.
  • Always double-check levels after first warm-up and top off as the oil will settle throughout the engine and transmission.

MotoSport.com Pro Tips

  • Keep a dedicated maintenance log for your CRF250R oil changes—this pays dividends come rebuild or resale time.
  • Recycle your used oil and filter at your local auto parts store or designated disposal center.

By following these steps, you ensure optimal performance from your 2008 Honda CRF250R and keep it in race-ready condition every time you ride.

Related Shopping Categories

Shop Motor Oil for a 2008 Honda CRF250R Dirt Bike.

Shop Oil Filters for a 2008 Honda CRF250R Dirt Bike.

Shop Oil Drain Pans for a 2008 Honda CRF250R Dirt Bike.

Shop Tools for a 2008 Honda CRF250R Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2008 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.