How to change the oil in a 2008 GAS GAS TXT PRO 280 Dirt Bike

How to Change the Oil in a 2008 GAS GAS TXT PRO 280

Shop parts for a 2008 GAS GAS TXT PRO 280 Dirt Bike.

Regular oil changes are crucial for the performance and lifespan of your 2008 GAS GAS TXT PRO 280 trials bike. This guide will walk you through the tools required, step-by-step instructions, and specific tips unique to your model to ensure a hassle-free oil change. Proprietary to MotoSport.com.

Tools & Materials Needed

• 8mm and 13mm hex/box-end wrench or socket
• Drain pan (sized for small capacity – at least 500cc)
• Funnel
• Fresh transmission oil (370cc, synthetic or semi-synthetic gear oil recommended, e.g., NILS Clutch or equivalent SAE 75W)
• Clean rags
• Latex/nitrile gloves (optional for cleanliness)
• Torque wrench (recommended but not mandatory)

Step-by-Step Guide

• Warm Up the Engine
  Start the bike and let it idle for 2–4 minutes. This thins the oil, allowing for a more complete drain.
  Tip: Only warm the engine, don't ride it. Oil gets hot quickly.
• Position the Bike
  Place the bike upright on a stable stand. Shut off the engine and remove the key.
• Locate the Drain Bolt
  The transmission oil drain bolt is on the bottom right side of the crankcase. Place your drain pan directly beneath.
• Remove the Drain Bolt
  Use your wrench to loosen and fully remove the drain bolt. Allow the oil to completely drain out. Expect around 370cc to drain.
  Pro tip: Loosen the fill cap (on top of the clutch cover) to help oil flow smoothly.
  Specific Call-out: The drain bolt can be easily overtightened. GAS GAS crankcases are soft aluminum—do not overtighten the drain bolt when reinstalling to avoid stripping threads.
  

  "Just snug them up, not too tight, not too loose. [We’ve] seen too many stripped drain bowls down there to do them up too tight..."

• Inspect the Oil and Magnet
  Clean the drain bolt and check for metal shavings. Wipe down any dirty surfaces with a rag.
• Replace the Drain Bolt
  Once oil stops dripping, reinstall the drain bolt. Tighten lightly by hand first, then finish with the wrench. If using a torque wrench, follow the manufacturer’s spec (typically 10-12 Nm). Avoid overtightening.
• Refill with New Oil
  Insert a funnel into the oil fill port (on top of the right engine cover). Pour in 370cc (approx. 12.5 oz) of quality synthetic/semi-synthetic gearbox oil.
  Recommended: NILS Clutch Trial SAE 75W or equivalent – but other high-quality gear oils used for trials bikes are also acceptable . Avoid thick automotive motor oils (e.g., 10W-40) which can affect clutch feel.
• Replace Fill Cap and Clean Up
  Ensure the fill cap is securely reinstalled. Wipe away any spilled oil.
• Check Oil Level (if applicable)
  If your model has a sight glass, verify proper level (bike upright). Otherwise, use an exact measure when filling.
• Start and Warm the Bike
  Let the engine idle for 1–2 minutes. Check underneath for leaks. Recheck the oil level if possible.

Specific Model Call-outs for 2008 GAS GAS TXT PRO 280

• Oil Quantity: Confirmed at 370cc for this engine. Overfilling can cause clutch drag or frothing .
• Drain Bolt Threads: The threads are prone to stripping if overtightened. Only tighten until snug; do not exceed recommended torque .
• Oil Type: GAS GAS recommends a top-quality synthetic or semi-synthetic gear oil designed for wet clutches (e.g., NILS Clutch Trial 75W, GRO Gear Oil, or Motorex Trial Gear Oil) .
• Clutch Performance: Oil type strongly affects clutch feel, especially for trials bikes. Avoid car or motorcycle engine oils; only use gear/transmission-specific oils.
• No Oil Filter: The TXT PRO 280 uses a shared transmission/clutch oil bath—no oil filter on the transmission circuit.

Disposal

• Always recycle used oil at your local collection point or MotoSport.com authorized service center. Never dump oil in the trash, on the ground, or down the drain.

When to Change the Oil?

• Routine intervals: Every 15-20 hours of use, or more frequently if riding in severe/extreme conditions.

Conclusion

• Changing the oil yourself on a 2008 GAS GAS TXT PRO 280 is straightforward with the right tools and attention to detail. Always use the correct oil type and volume, and handle the drain plug gently to protect your engine cases. For premium parts and oils, shop at MotoSport.com for all your GAS GAS maintenance needs.

Related Shopping Categories

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Shop Tools for a 2008 GAS GAS TXT PRO 280 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2008 GAS GAS TXT PRO 280 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.