How to Change the Oil in a 2025 GAS GAS EX 350F

Shop parts for a 2025 GAS GAS EX 350F Dirt Bike.

Changing the oil in your 2025 GAS GAS EX 350F is a crucial maintenance task that ensures optimal engine performance and longevity. Follow this comprehensive how-to guide, proprietary to MotoSport.com, to keep your dirt bike running smoothly.

Tools and Supplies Needed

  • 1.0 liter of Motorex Cross Power 4T 10W/50 full synthetic oil (recommended by GAS GAS)
  • OEM oil filter
  • New drain bolt crush washer
  • Oil drain pan
  • 13mm socket or wrench
  • 5mm and 8mm Allen wrenches
  • Needle nose pliers (for oil strainer removal)
  • Torque wrench
  • Paper towels or clean rags
  • Gloves
  • Contact cleaner (optional for cleanup)

Steps to Change the Oil on a 2025 GAS GAS EX 350F

  1. Warm Up the Engine
    • Start your EX 350F and let it idle for a few minutes. Warm oil flows and drains more efficiently, removing more contaminants.
  2. Turn Off the Engine – Ensure Safety
    • Turn off the ignition. Put the bike securely on a stand. Let it cool for a minute but keep the oil warm.
  3. Remove the Skid Plate (if equipped)
    • If your bike has a skid plate, remove it using the correct Allen wrench to access the drain bolts.
  4. Drain the Engine Oil
    • Locate the main drain bolt beneath the engine. Place your drain pan underneath.
    • Use a 13mm socket/wrench to loosen and remove the drain bolt. Watch for the crush washer–replace it with a new one during reassembly for proper sealing.
    • Allow all the oil to drain out completely. This might take several minutes.
  5. Remove and Clean the Oil Strainer
    • Locate the oil strainer bolt, typically requiring a 13mm socket or Allen wrench, and remove it. Be mindful of some residual oil draining out.
    • Carefully remove the oil strainer with needle nose pliers. Inspect the strainer for debris or metal particles–clean it with contact cleaner if needed.
    • Check O-rings for wear or deformation; replace if necessary.
  6. Replace the Oil Filter
    • Find the oil filter cover (generally on the engine’s right side). Unscrew the cover using the appropriate Allen wrench.
    • Remove the cover and old oil filter. Carefully clean the inside of the filter housing if necessary.
    • Install the new OEM oil filter, ensuring it’s seated properly. Replace the oil filter cover, tightening bolts to manufacturer torque specs.
  7. Reinstall the Oil Strainer and Drain Bolt
    • Refit the cleaned oil strainer and the oil strainer bolt. Install a new crush washer on the drain bolt, then screw in the main drain bolt.
    • Use a torque wrench to tighten both bolts to the specifications listed in your owner’s manual (refer to your specific manual for 2025 EX 350F values; typically around 15 Nm for the drain bolt).
  8. Refill with Fresh Oil
    • Remove the oil fill cap located on the engine case.
    • Pour in 1.0 liter of Motorex Cross Power 4T 10W/50 full synthetic oil (capacity may vary slightly; always double-check your owner’s manual).
    • Replace and tighten the oil fill cap.
  9. Start and Inspect
    • Start the engine and let it idle for 30 seconds. Check for oil leaks, especially around the drain bolt, strainer, and oil filter cover.
    • Turn off the engine, give the oil time to settle, then check oil level via the sight glass or dipstick. Top off as necessary.
  10. Dispose of Old Oil and Materials Safely
    • Take used oil and filter to a certified recycling facility.
    • Clean your tools and work area.

2025 GAS GAS EX 350F Specific Call-Outs

  • The oil change process for the 2025 EX 350F closely follows previous EX/MC/FX 350 models (see 2023/2024 guides) as no major procedural changes have been reported for the newest model year .
  • GAS GAS recommends full synthetic 10W/50 oil (like Motorex Cross Power 4T) and the use of their OEM filter kit, both of which are included in most aftermarket oil change kits .
  • Torque specs and oil capacity: Always double-check with the owner’s manual for your 2025 EX 350F as values can slightly differ even between similar models. Documented torque for the main drain bolt is generally 15 Nm, but confirm for your bike.
  • Replace all crush washers, seals, and O-rings during each oil change to prevent leaks.
  • Watch for debris in the oil strainer–significant buildup could indicate engine wear.
  • Change your oil at least every 15 hours of engine operation, or sooner in race conditions.

Final Tips

  • Always work on a cool, stable bike after warming the engine gently.
  • Use only the oil type and capacity specified by GAS GAS.
  • Document your oil changes (date, hours on bike) to keep on maintenance schedule.
  • If unsure at any step, refer to the official owner’s manual or consult a GAS GAS-certified mechanic.

Related Shopping Categories

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Shop Tools for a 2025 GAS GAS EX 350F Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2025 GAS GAS EX 350F 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.