How to Change the Oil in a 2021 Honda CRF300L — MotoSport.com Guide

Shop parts for a 2021 Honda CRF300L Dirt Bike.

Regular oil changes are essential maintenance to keep your 2021 Honda CRF300L running smoothly and prolong engine life. This comprehensive guide details all necessary tools, step-by-step instructions, and model-specific insights for changing your CRF300L’s oil and oil filter.

Tools and Supplies Needed

  • Socket wrench set (including 12mm socket for drain bolt and 8mm for filter cover)
  • Torque wrench (with range to 24 Nm)
  • Oil drain pan
  • Funnel
  • Shop rags or paper towels
  • New oil filter (Honda OEM or equivalent for CRF300L)
  • Replacement engine oil: Pro Honda GN4 10W-30 or equivalent, meeting API SJ or higher & JASO MA specs
  • New drain bolt copper washer/gasket (recommended but not mandatory if current is undamaged)
  • Gloves (optional, for cleanliness)

Engine Oil Requirements

  • Engine oil capacity (oil & filter change): 1.5 liters (1.6 US quarts)
  • Engine oil capacity (oil only): 1.4 liters (1.5 US quarts)
  • Oil specification: 10W-30, API SJ or higher (not energy/resource conserving), JASO MA

Preparation

  • Warm up your motorcycle (idle several minutes) to ensure oil flows easily.
  • Turn off the engine, secure the bike on level ground using the side stand or bike stand.
  • Lay rags under the drain bolt to catch spills.

Step-By-Step Oil Change

  1. Remove the Oil Filler Cap
    – Unscrew the oil filler cap — this lets oil drain out faster and more completely.
  2. Remove the Drain Bolt and Drain Oil
    – Place the oil pan under the drain plug (bottom of engine).
    – Use your 12mm socket to loosen and remove the drain bolt.
    – Allow oil to drain completely (tilt bike upright briefly for thorough drainage).
    – Inspect the washer/gasket; replace if damaged or excessively compressed .
  3. Remove and Replace the Oil Filter
    – Locate the oil filter cover (right side, next to sight glass).
    – Remove cover bolts (8mm socket); keep track of orientation.
    – Remove old oil filter.
    – Wipe out debris/sediment inside housing .
    – Install new filter, ensuring correct orientation (spring facing engine if spring present).
    – (Tip: Pre-fill new filter with fresh oil to reduce engine start-up wear ).
    – Reinstall cover; tighten bolts in a crisscross pattern to 9 Nm .
  4. Reinstall the Drain Bolt
    – Clean drain bolt threads.
    – Reinstall with new or reused washer; torque to 20–24 Nm (do not overtighten) .
  5. Refill with Fresh Engine Oil
    – Place clean funnel in filler neck.
    – Pour in 1.5 liters (1.6 quarts) of oil (for filter change) or 1.4 liters (1.5 quarts) (for oil-only change) .
    – DO NOT OVERFILL. Adding too much oil can harm the engine.
    – Reinstall filler cap.
  6. Check Oil Level
    – Start engine and let idle for 3 minutes, then turn off .
    – Wait 2–3 minutes for oil to settle.
    – Hold bike upright on level ground and check the sight glass — oil should be between upper and lower marks .
    – Top off oil if needed, being careful not to overfill.
  7. Final Steps
    – Check all points (drain bolt, filter cover) for leaks with engine idling.
    – Wipe off any spillage.
    – Properly dispose of used oil and filter at a local recycling center.
    – Note the current mileage and date — schedule your next oil change according to your riding conditions and Honda’s recommendations.

2021 CRF300L Model-Specific Callouts

  • This bike uses a side sight glass — always check the oil with the bike held upright, not on the side stand .
  • Oil capacity increases marginally with filter changes (from 1.4L to 1.5L), so always verify which service you are performing.
  • Torque specs are important — avoid damaging soft aluminum threads by overtightening the drain bolt or filter cover.
  • Use recommended oil only — using non-motorcycle-specific or “energy conserving” oils may cause clutch/glazing issues .
  • Dispose of used oil responsibly to protect your environment and comply with regulations.

Changing your 2021 Honda CRF300L's oil is straightforward and crucial for engine longevity. By following these steps and using the specified tools and materials, you’ll keep your dirt bike ready for adventure. For more model-specific maintenance guides and all your gear needs, trust MotoSport.com.

Related Shopping Categories

Shop Motor Oil for a 2021 Honda CRF300L Dirt Bike.

Shop Oil Filters for a 2021 Honda CRF300L Dirt Bike.

Shop Oil Drain Pans for a 2021 Honda CRF300L Dirt Bike.

Shop Tools for a 2021 Honda CRF300L Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2021 Honda CRF300L 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.