How to Change the Oil in a 2019 Honda CRF150R

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Tools and Materials Needed

  • 10mm and 12mm sockets or wrenches
  • Socket wrench
  • Oil drain pan
  • Funnel
  • Clean rags or shop towels
  • New crush washers (recommended)
  • New oil filter and o-ring (if changing the filter)
  • Honda GN4 10W-40 oil (or equivalent; see call-outs for quantities)
  • Replacement transmission oil (if changing gearbox oil, 80W or 85W specialty recommended for transmission)
  • Torque wrench (optional, for drain bolt torqueing)
  • Gloves

Specific Model Call-Outs: 2019 Honda CRF150R

  • This model uses separate engine and transmission oil compartments. Do not mix the two fluids or locations.
  • Engine oil change (with filter): 590cc GN4 10W-40.
  • Engine oil change (without filter): 560cc.
  • Transmission oil: 580cc GN4 10W-40, but many owners prefer a dedicated 80W/85W transmission oil for better clutch feel and durability.
  • Both sides require new crush washers for the drain bolts to prevent leaks.
  • Be careful not to over-tighten or cross-thread the drain bolts. Stripping them is a common (– and costly –) mistake.

Step-by-Step Guide

  1. Warm Up the Engine
    • Start the bike and let it idle for 3–5 minutes. This allows the oil to warm and thin, ensuring more complete drainage.
    • Turn off the engine. Let the bike sit for a minute or two so components are warm but not dangerously hot.
  2. Prepare the Bike
    • Place the bike on a stable, level surface—preferably a bike stand.
    • Put on gloves and position your oil drain pan under each drain bolt.
  3. Drain the Engine Oil
    • Locate the engine oil drain bolt (see owner’s manual or refer under the engine side below the cylinder).
    • Remove the bolt with a 12mm socket and let the oil fully drain into the pan.
    • If you’re changing the oil filter, remove engine side cover bolts and replace the filter and o-ring at this time.
    • Discard the old crush washer and fit a new one on the bolt.
    • Reinstall the drain bolt and torque to manufacturer spec (do not overtighten.)
  4. Drain the Transmission Oil
    • Locate the transmission drain bolt (opposite side of engine, below clutch assembly).
    • Remove the bolt and allow all old transmission oil to drain.
    • Install a new crush washer and refit the drain bolt securely.
  5. Fill with New Oil
    • Remove the engine oil fill cap (above drain bolt) and insert a funnel.
    • Pour in 590cc of 10W-40 oil (with filter change) or 560cc (without filter change). Pour slowly to prevent spillage or air locks.
    • Replace and tighten the dipstick/fill cap when complete.
    • Repeat process for the transmission side: remove fill cap, use a funnel, and pour in 580cc of correct oil .
  6. Check Oil Levels and Leaks
    • Start the engine and run for a 1–2 minutes. Shut down and let the bike sit for several minutes.
    • With the bike level, unscrew the dipstick, wipe, reinsert, and check the oil level. Top off if low.
    • Inspect both drain bolts for leaks. Tighten further only if necessary, but avoid overtightening.
  7. Clean Up and Dispose of Oil Responsibly
    • Wipe up any spills. Dispose of used oil and filters at a proper recycling facility.
    • Give the bike a gentle wipe-down to remove any residue.

Extra Tips for the 2019 CRF150R

  • You can safely use the same 10W-40 oil in both compartments if using Honda GN4; however, racers often prefer a higher viscosity gear oil for the transmission for improved clutch and gearbox longevity.
  • Always use new crush washers to avoid common oil leaks after service.
  • Be mindful of the amount of oil per compartment. Overfilling can cause increased crankcase pressure and leaks.
  • After initial startup, recheck fluid levels and top off if necessary.
  • Keep a record of your oil changes—date, engine hours, and any notes about filter and washer replacements.

Why Regular Oil Changes Are Essential for Your CRF150R

  • Honda's high-performance, small-displacement engines are engineered with tight tolerances and run at higher RPMs, demanding clean and high-quality oil to prevent wear and overheating.
  • Neglecting oil changes can result in premature engine or transmission wear, clutch slippage, and even catastrophic failure.

Conclusion

Changing the oil on your 2019 Honda CRF150R is one of the simplest ways to ensure performance and reliability, whether you're riding trails or racing. Always use the recommended fluids, appropriate quantities, and do not neglect the washer replacement at each change for a trouble-free dirt bike experience.

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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.