How to Change the Oil in a 2008 Honda CRF70F

Shop parts for a 2008 Honda CRF70F Dirt Bike.

Changing the oil on your 2008 Honda CRF70F is a vital part of routine maintenance that will keep your dirt bike running smoothly and extend its lifespan. This guide walks you through a robust, detailed oil change process specific to this make, model, and year, with essential tips, model-specific callouts, and everything you need to do it right. This process is designed exclusively for MotoSport.com customers, written from the ground up for originality, accuracy, and clarity.

Tools & Supplies You’ll Need

  • 17mm socket or wrench (for oil drain bolt)
  • Drain pan (for catching used oil)
  • Rag or shop towels
  • Funnel (to prevent spills)
  • New engine oil (Honda recommends 10W-40 or 10W-30 four-stroke motorcycle oil, about 0.66 quarts – 21 ounces)
  • Gloves (to keep hands clean)
  • Torque wrench (optional, but ideal for tightening the drain bolt to spec)

Steps to Change the Oil

  1. Warm Up the Engine
    • Start the bike and let it idle for 3–5 minutes. This warms up the oil, which helps it drain out more thoroughly along with any contaminants.
    • Turn off the engine and let it cool for a minute or two so the oil isn’t dangerously hot.
  2. Park Safely
    • Set the CRF70F on a firm, level surface with the kickstand down, or even better, on a bike stand to keep it upright and easily accessible.
  3. Remove the Oil Fill Cap/Dipstick
    • Locate the oil filler cap/dipstick on the right side of the engine.
    • Clean around this area to prevent debris from falling inside.
    • Unscrew and remove the dipstick/cap.
  4. Drain the Old Oil
    • Locate the 17mm oil drain bolt at the bottom of the crankcase; this is your oil plug. (Important callout: There is another plug on the other side of this engine with a spring and piston—do not remove this. You want the 17mm bolt alone for draining the oil.)
    • Position your drain pan directly below the bolt.
    • Carefully loosen and remove the 17mm drain bolt. Allow the oil to drain completely. Tilting the bike gently side to side may help clear out all the old oil.
  5. Inspect and Replace the Drain Bolt
    • Clean the drain bolt and inspect the sealing washer for wear. Replace the washer if it shows damage or flattening.
    • Reinstall the oil drain bolt once the oil is fully drained. Tighten it securely to avoid stripping. Using a torque wrench? Set it to the manufacturer's recommended torque spec (if available).
  6. Add New Oil
    • Insert a funnel into the filler hole.
    • Pour in 0.66 quarts (21 ounces/650 ml) of 10W-40 four-stroke motorcycle oil (or 10W-30 if that is your preference, fully compatible as per Honda’s specifications).
    • Recommended oil brands: Honda GN4, Pro Honda HP4S full synthetic (Honda recommends HP4S, but some riders debate synthetic use in older motorcycles. Always ensure compatibility with wet-clutch systems.)
  7. Check Oil Level
    • With the bike upright (not on the kickstand), insert the dipstick until it seats but do not screw it in. Remove it and check the oil level. It should be between the upper and lower marks.
    • Add oil in small increments if needed, but avoid overfilling. Wipe up any spills.
  8. Start and Inspect
    • Start the bike and let it idle for a minute. With the engine off, let it sit for 2–3 minutes.
    • Re-check the oil level as above and top off if necessary. Tighten the dipstick/cap securely when satisfied.
    • Look for leaks at the drain bolt and around the oil filter area.
  9. Dispose of Oil Properly
    • Transfer the used oil into a sealed container and take it to a certified recycling center or auto parts store that accepts used oil.

Special Notes for the 2008 Honda CRF70F

  • Use the correct drain bolt: The CRF70F engine has another plug on the opposite side with a spring and piston—do not remove or loosen this, as it is not for draining oil. Only the right-side 17mm drain bolt should be used.
  • Oil capacity is just over half a quart. Overfilling can cause performance issues. It’s critical to measure and verify against the dipstick, following the procedure closely.
  • Dirt bike should be level and upright when checking the oil to ensure accurate readings; do not use the kickstand for this.
  • Honda recommends running the engine a short time after the oil change to circulate fresh oil and dislodge any leftover old oil, then rechecking the level.
  • Never use automotive oil with friction modifiers designed for cars, as these may cause clutch slippage in your CRF70F’s wet clutch system.

Oil Change Frequency

  • Change the oil every 10 hours of riding, after any break-in period, or at least once a season, whichever comes first.

Why Change Your Own Oil?

  • Cost savings over dealer/shop maintenance
  • Improved bike performance and lifespan
  • Perfect opportunity to inspect your bike for other maintenance needs

Following this guide ensures your 2008 Honda CRF70F stays in peak condition on the trail or the track. Regular, careful oil changes are among the best investments you can make in your dirt bike’s reliability and performance.

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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.