How to Change the Oil in a 2018 GAS GAS TXT GP 300

Shop parts for a 2018 GAS GAS TXT GP 300 Dirt Bike.

Changing the oil in your 2018 GAS GAS TXT GP 300 is a crucial maintenance task that preserves the longevity of your transmission and ensures smooth operation on the trails or at competitions. This guide, proprietary to MotoSport.com, details all the necessary tools, precise steps for your specific model and year, and includes key call-outs to help you make this essential service easy and effective.

Tools and Materials Needed

  • Socket wrench set (10mm and 13mm recommended)
  • Drain pan
  • Funnel (a small one is ideal)
  • Clean rags or paper towels
  • New transmission oil (Type: NILS Clutch Trial, Capacity: 370cc for this engine)
  • Torque wrench (optional but highly recommended)
  • New drain plug washer (optional: replace if damaged)
  • Nitrile gloves (recommended for cleanliness)

Step-by-Step Instructions

  1. Warm Up the Engine
    • Run your motorcycle for 2-3 minutes to thin the oil. This makes it drain faster and removes more contaminants.
    • Shut the bike off and place it upright on a level surface, using a stand if possible.
  2. Locate the Oil Drain Plug
    • On the 2018 GAS GAS TXT GP 300, the drain bolt is on the underside of the engine. Refer to your owner's manual for the exact location and torque specs (bolt size is usually 13mm).
    • Place the drain pan beneath this bolt.
  3. Remove the Drain Bolt and Drain Old Oil
    • Using a socket wrench, carefully loosen and remove the drain plug.
    • Allow the oil to fully drain into the pan. This may take several minutes.
    • Inspect the magnetic tip of the drain plug for metal shavings. Small metallic particles are normal, but an abundance of large fragments could indicate gear problems.
  4. Replace or Clean Washer and Reinstall Drain Bolt
    • Wipe the drain bolt and washer. If the washer is damaged, replace it to ensure a proper seal.
    • Reinstall the drain plug and tighten to manufacturer specs. Do not overtighten; use a torque wrench if possible.
    • Wipe off any spilled oil or residue around the drain area.
  5. Refill with New Oil
    • Locate the oil fill plug, usually on the right side of the engine casing.
    • Insert a funnel and pour in 370cc of the recommended oil (often NILS Clutch Trial; always confirm with your owner's manual).
    • Using a small funnel is critical on these bikes due to the restricted access to the fill port. Attempting to pour directly usually makes a mess.
  6. Check Oil Level
    • There is generally a sight glass or a specific measuring bolt on GAS GAS engines. If equipped, verify correct level as directed in your manual.
    • Replace and tighten the oil fill cap securely.
  7. Pre-Start Check
    • Before starting, slowly kick the starter by hand 2-3 times (with the ignition off) to help circulate oil throughout the transmission.
    • Start the engine and let it idle for a minute. Shut it off and inspect for leaks.
    • Double-check the oil level and adjust if needed.

Model-Specific Call-Outs for the 2018 GAS GAS TXT GP 300

  • Oil Quantity: The official capacity is 370cc for the transmission. Overfilling or underfilling can lead to gear or clutch issues.
  • Oil Type: Use the manufacturer-recommended NILS Clutch Trial or a high-quality equivalent specifically made for trial motorcycle clutches.
  • Drain Bolt: The bolt is fitted with a magnetic tip to catch debris; excessive debris buildup is an indicator of abnormal wear.
  • Fill Access: The oil fill port is difficult to access; always use a small, clean funnel to avoid spills.
  • Gasket/Washer: The sealing washer should be replaced if damaged or after every few oil changes to prevent leaks.
  • Disposal: Always dispose of used oil properly according to local regulations.

Expert Tips

  • Keep detailed service records. Note the date and hours ridden since last oil change.
  • Check for leaks around the drain plug and fill cap after the ride. If you spot even a minor drip, recheck the tightness of both.
  • If unsure about procedure or encountering resistance during bolt removal/installation, consult your local GAS GAS dealer or a qualified mechanic.

This oil change process keeps your 2018 GAS GAS TXT GP 300 running reliably, with smooth clutch operation and extended gearbox life. For genuine parts, premium lubricants, and trusted gear, turn to MotoSport.com—your dirt bike experts.

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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.