How to Change the Oil in a 2015 GAS GAS TXT PRO 250

Shop parts for a 2015 GAS GAS TXT PRO 250 Dirt Bike.

Regular oil changes are essential to keep your 2015 GAS GAS TXT PRO 250 running smoothly and to ensure a long engine life. Below, you'll find a comprehensive, MotoSport.com proprietary guide including the required tools, step-by-step instructions, and special considerations for your specific dirt bike model.

Tools and Supplies Needed

  • Wrenches:– Correct size (typically 13mm or as needed for your drain bolt and filler plug)
  • Socket Set or Spanners:– To remove drain and fill plugs
  • Drain Pan:– For catching old oil
  • Rags or Shop Towels:– For cleaning up spills and wiping down components
  • Funnel:– For adding new oil
  • New Transmission/Clutch Oil:– 370cc (as specified in GAS GAS documentation), recommended NILS Clutch Trial oil or a high-quality gear/transmission oil suited for wet clutch trials bikes
  • Gloves:– For personal protection
  • Replacement Crush Washer:– Optional, but recommended for sealing the drain bolt

Preparation

  • Warm up the engine for a few minutes so the oil flows out more easily. Do not get the bike too hot to avoid burns.
  • Place your motorcycle on a stable stand to keep it upright and safe during the service.
  • If your bike is dirty, clean the area around the drain plug and filler cap to prevent debris from contaminating the oil or engine components.

Steps to Change the Oil on a 2015 GAS GAS TXT PRO 250

  1. Remove the Drain Plug
    • Locate the oil drain plug under the crankcase (check your owner's manual if uncertain).
    • Position your oil drain pan directly under the plug.
    • Use the correct size wrench to loosen and remove the drain bolt. Allow the oil to drain completely—this may take a few minutes depending on oil temperature and viscosity.
    • Watch for the crush washer, which sometimes sticks to the engine or comes off with the bolt. Inspect it; replace it if compressed or damaged, or anytime you see signs of leaking.
  2. Reinstall the Drain Plug
    • Once old oil is finished draining, wipe the area clean with a rag.
    • Install a new crush washer on the bolt if needed.
    • Screw the drain plug back in by hand, then tighten gently with the wrench. Do not over-tighten–just snug enough to seal, as overtightening is a common cause of stripped threads in dirt bikes.
  3. Remove the Filler Plug
    • On the right side of the engine, locate and remove the oil filler plug using the appropriate tool.
    • Use a clean rag to wipe away any debris from around the opening to keep contaminants out of the system.
  4. Add New Oil
    • Insert a funnel into the oil fill opening.
    • Pour in 370cc of high-quality trials transmission oil, such as NILS Clutch Trial oil. Do not exceed this quantity as overfilling can cause clutch drag and gear selection problems.
    • Allow the oil to settle, then check the level. Some models have a sight glass or dipstick–consult your manual for specifics.
  5. Reinstall the Filler Plug
    • Wipe the threads clean and reinstall the filler plug securely, being careful not to cross-thread or over-tighten.
  6. Clean Up and Check
    • Wipe away any oil from the engine cases and check for leaks at both the drain and filler plugs after running the engine briefly.
    • If you spot a leak, stop the engine, allow it to cool, and check the tightness of both plugs.
    • Properly dispose of your old oil at an approved recycling center.

2015 GAS GAS TXT PRO 250 Specific Notes and Call-Outs

  • Oil Capacity:– This model requires exactly 370cc of oil in the transmission. Over- or under-filling can harm performance and longevity.
  • Oil Type:– Use only transmission/clutch-specific oil designed for trials bikes (NOT standard 2-stroke premix for the engine; fuel/oil mix for combustion is separate). Many owners prefer premium synthetic or semi-synthetic gear oils.
  • Drain Plug Caution:– The drain plug threads in these cases are relatively delicate. Always avoid overtightening to reduce risk of stripping aluminum threads.
  • Oil Change Frequency:– Consider changing oil every 15–20 hours of riding, or more frequently in harsh riding conditions or competitions (as per manufacturer's or your mechanic's advice).
  • Clutch Feel:– Trials bikes like the TXT PRO 250 are sensitive to oil changes; using the recommended oil type helps maintain a light, progressive clutch pull.
  • Check for Metal Shavings:– When draining, observe for excess metal particles. A small amount is normal, but a significant quantity may indicate internal wear requiring further inspection.

Final Thoughts

Changing your transmission/clutch oil is a straightforward job, but regular attention will keep your 2015 GAS GAS TXT PRO 250 performing at its best. For genuine parts, oils, and expert gear, shop MotoSport.com—your trusted source for everything dirt bike.

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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.