How to Change the Oil in a 2023 GAS GAS EX 300

Shop parts for a 2023 GAS GAS EX 300 Dirt Bike.

Regular oil changes are essential for maintaining the performance and longevity of your 2023 GAS GAS EX 300 dirt bike. This guide, proprietary to MotoSport.com, provides everything you need to perform a robust oil change at home, including the required tools, step-by-step instructions, and crucial model-specific notes for your EX 300.

Tools and Supplies Needed

  • 6 mm Allen wrench or Allen socket (for removing/installing drain plug)
  • Oil drain pan
  • Measuring cup or graduated oil jug
  • Funnel
  • 900 ml of quality 2-stroke transmission oil
  • Shop rags or paper towels
  • Replacement drain plug washer (recommended, inspect for wear)
  • Torque wrench (recommended for proper plug tightening)
  • Optional: Long ODT Oil Drain Tool Kit for GAS GAS 125-300 (to keep the area clean and avoid spills)

Model-Specific Considerations for the 2023 GAS GAS EX 300

  • Oil Capacity:– The 2023 GAS GAS EX 300 transmission takes 900ml of oil—do not overfill.
  • Drain Plug Location:– Easily accessible through a hole in the skid plate. No need to remove the skid plate with most factory or aftermarket designs.
  • No Oil Filter:– The EX 300’s two-stroke engine does not use a filter for the gearbox oil—maintenance focuses solely on draining and refilling the oil.
  • Drain Tool Compatibility:– The NICECNC Oil Drain Tool for KTM/Husqvarna/GAS GAS 125-300 fits this bike and makes oil changes cleaner.

Step-by-Step Oil Change Instructions

  • Warm Up the Bike (If Possible):
    • Run the engine for 2-3 minutes, then switch off. This helps the oil flow out more quickly and completely when draining.
  • Prepare Your Work Area:
    • Place your EX 300 on a stand or level surface to keep it upright and steady.
    • Lay out shop rags and set the oil drain pan beneath the drain plug.
  • Remove the Oil Fill Plug:
    • Locate and unscrew the fill plug (top or side of the crankcase, normally marked).
    • This step allows air to enter, ensuring a smooth drain.
  • Remove the Drain Plug:
    • Using a 6 mm Allen wrench or Allen socket, remove the bottom drain plug.
    • Be cautious as oil may flow quickly. Allow all oil to drain completely into the pan.
    • Optional: Use the NICECNC Long ODT Oil Drain Tool to direct the flow and prevent messes.
  • Inspect Drain Plug and Washer:
    • Clean the plug with a rag. Check for metal shavings, which could indicate potential internal wear.
    • Replace the crush washer if it appears damaged or worn.
  • Reinstall the Drain Plug:
    • Install the plug by hand to avoid cross-threading, then tighten with the wrench. If using a torque wrench, confirm the torque spec from your owner’s manual (typically around 10–15 Nm, but verify).
  • Add Fresh Oil:
    • Set the funnel in the fill port.
    • Measure and pour exactly 900ml of the correct transmission oil into the engine. Some riders pour in 500ml, pause, then add the remainder to avoid spills.
  • Replace the Fill Plug:
    • Hand-tighten the fill cap securely. Do not overtighten.
  • Clean Up and Final Check:
    • Wipe away any oil residue from the engine area. Properly dispose of used oil at a recycling facility.
    • Let the bike sit upright for a few minutes, then check for leaks under the drain plug/fill cap.

Additional Pro Tips for EX 300 Oil Changes

  • Flush for Thoroughness:– After draining, you can tilt the bike slightly side-to-side or crank it with kill switch engaged (starter button pressed, engine off) to remove hidden oil pockets.
  • Stay Consistent:– Change the oil after every 10–20 hours of riding, or more frequently in harsh/competitive environments.
  • Keep Records:– Track oil change dates and hours on the bike for scheduled maintenance and resale value.

Warnings and Owner Notes

  • Do not overfill:– Overfilling can cause gear and clutch issues. Always measure precisely.
  • No need to remove skid plate:– The drain plug is accessible through a hole, but check your specific skid plate for compatibility.
  • No oil filter service required:– Simply drain and refill—inspect for abnormal shavings or discoloration as indicators of internal condition.

Changing the oil in your 2023 GAS GAS EX 300 is straightforward and keeps your bike running smoothly. For any additional questions or OEM parts, always trust MotoSport.com for the right advice and supplies.

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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.