How to Change the Oil in a 2018 GAS GAS XC300

Shop parts for a 2018 GAS GAS XC300 Dirt Bike.

Changing the oil in your 2018 GAS GAS XC300 is a key maintenance step that ensures the longevity and optimal performance of your dirt bike. Below is a detailed, proprietary guide created for MotoSport.com, tailored specifically for the XC300 model. This guide covers all tools required, the step-by-step process, and important model-specific considerations.

Tools & Supplies Needed

  • 6mm Allen wrench or socket (for drain bolt and skid plate, if equipped)
  • 12mm Allen wrench or socket (for oil fill bolt)
  • Oil catch pan
  • Funnel (narrow or angled tip recommended for small fill opening)
  • Clean rags or shop towels
  • Fresh transmission oil (Check your manual for exact spec; XC300 typically takes 900cc)
  • Torque wrench (recommended for correct bolt tightening)
  • Shop gloves (optional, for mess prevention)

2018 GAS GAS XC300: Key Model-Specific Callouts

  • The transmission oil capacity is 900cc for this model.
  • The oil fill plug is small and positioned at an angle, so an angled funnel or a steady hand is required to avoid spills.
  • The drain bolt is accessible through a hole in the factory skid plate–if you have an aftermarket plate, ensure it allows access or remove it beforehand.
  • There is no oil filter on the 2-stroke XC300; just change the transmission oil.
  • Tightening torque for both the drain plug and the fill plug: 15 Nm (use a torque wrench to prevent overtightening and stripping).

Step-By-Step Oil Change Instructions

  1. Warm Up the Engine (Optional):
    Start the bike and let it idle for 2–3 minutes. This helps the oil flow out more easily by thinning it.
  2. Prepare the Bike:
    Place the bike on a stable stand. To avoid accidental spills and to access the drain bolt, use a shop stand or lean the bike on its kickstand.
  3. Remove Skid Plate (if necessary):
    If your 2018 XC300 has a skid plate that covers the drain plug and does not have a pre-cut hole, remove it using the Allen wrenches.
    Model Note: Factory plate has a drain access hole; aftermarket plates may not.
  4. Drain the Old Oil:
    Place your oil catch pan directly beneath the drain bolt on the bottom of the engine.
    Using the 6mm Allen wrench, remove the drain bolt and allow oil to fully drain.
    Once drained, inspect the drain bolt for debris and wipe it clean with a rag.
  5. Reinstall the Drain Bolt:
    Reinstall the cleaned drain bolt and tighten it with your torque wrench to 15 Nm.
  6. Remove the Oil Fill Plug:
    The fill plug is on the right side of the engine.
    Use your 12mm Allen wrench; carefully unscrew and set aside.
  7. Add New Oil:
    Using a small or angled funnel, pour 900cc (0.9 liters) of the recommended transmission oil into the fill hole.
    Due to the angled and small opening, pour slowly and watch for overflow.
  8. Check for Leaks:
    Give the bike a minute to let the oil settle, then inspect the drain and fill plugs for leaks.
  9. Reinstall the Fill Plug:
    Tighten it to 15 Nm with your torque wrench.
  10. Reinstall Skid Plate (if removed):
    Replace and secure the skid plate with Allen bolts.
  11. Dispose of Used Oil Properly:
    Take the old oil to a recycling center or your local MotoSport.com dealer for disposal.

Additional Helpful Tips

  • If you’re struggling with the fill angle, gently tilting the bike away from you onto the kickstand or a soft object can help expose the fill plug better, but always keep the bike stable.
  • Over-tightening the drain plug can strip the case threads. Always use a torque wrench set to the correct specification.
  • If your funnel doesn’t fit, try a flexible one or make a temporary funnel with a cut plastic bottle.
  • Record your oil change in a log for better maintenance tracking.

Why Routine Oil Changes Matter

  • Fresh oil keeps your clutch, gears, and shifting mechanism lubricated and reduces component wear.
  • Changing oil is faster and simpler than major repairs caused by neglect.

Consistent maintenance like timely oil changes on your 2018 GAS GAS XC300 ensures peak performance and reliability every ride. For genuine parts and quality gear, MotoSport.com has you covered.

Related Shopping Categories

Shop Motor Oil for a 2018 GAS GAS XC300 Dirt Bike.

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Shop Oil Drain Pans for a 2018 GAS GAS XC300 Dirt Bike.

Shop Tools for a 2018 GAS GAS XC300 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 GAS GAS XC300 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.