How to Change the Oil in a 2025 GAS GAS ES 350F — Proprietary Guide for MotoSport.com

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Keeping your 2025 GAS GAS ES 350F running smoothly and reliably is essential for both performance and longevity. One of the most important maintenance tasks is regular oil changes. Below, you'll find a step-by-step, model-specific guide with the recommended tools, the process, and key notes an ES 350F owner should know.

Tools and Supplies Needed

  • 1.0 liter Motorex Cross Power 4T 10W/50 full synthetic oil (as per OEM recommendation)
  • OEM oil filter, compatible with the ES 350F
  • Oil drain bolt crush washer
  • Socket set (8mm, 12mm, 13mm sockets are standard – confirm with your owner's manual)
  • Torque wrench (recommended for proper bolt tightening)
  • Rags and contact cleaner
  • Oil drain pan
  • Paper funnel (for tidy refill)
  • Measuring cup (optional; helps ensure proper oil quantity)
  • Latex or nitrile gloves

Preparation Steps

  • Warm the engine for 3-5 minutes. This allows oil to flow out more easily and suspends contaminants for complete removal.
  • Turn off the bike and place it securely on a stand or center stand.
  • Make sure the area is clean and that the necessary tools and supplies are ready to use.

Step-by-Step Oil Change for 2025 GAS GAS ES 350F

  • 1. Remove the skid plate (if fitted):
    • This provides direct access to the drain bolt and oil filter.
  • 2. Drain the old oil:
    • Locate the oil drain plug at the bottom of the engine case.
    • Position the oil drain pan directly beneath the plug.
    • Using the appropriate socket, carefully loosen and remove the drain bolt. CAUTION: The oil may be hot.
    • Allow all oil to drain. Tilting the bike slightly side-to-side can help fully evacuate old oil.
    • Remove the old crush washer from the drain bolt (this must be replaced).
  • 3. Remove and replace the oil filter:
    • Locate the oil filter cover (typically on the right side of the engine).
    • Remove the bolts holding the oil filter cap – take note of their position and length.
    • Carefully pull out the old oil filter. If it sticks, gently tap the cover.
    • Clean the oil filter cavity with a rag or contact cleaner.
    • Install the new oil filter, ensuring it is properly seated. Lubricate the new filter's sealing ring lightly with fresh engine oil.
    • Reattach the oil filter cap and torque bolts to manufacturer's spec (around 7.4 Nm; very low torque, do not overtighten).
  • 4. Reinstall the drain bolt:
    • Slip the new crush washer onto the cleaned drain bolt.
    • Hand-thread the bolt into the case to ensure it's not cross-threaded.
    • Snug the bolt to manufacturer specification (check your model's manual, but typically 15-20 Nm is standard for GAS GAS 350 engines; do not overtighten).
  • 5. Add fresh oil:
    • Remove the oil fill cap on the right side of the engine.
    • Use a paper funnel to pour in exactly 1.0 liter of Motorex Cross Power 4T 10W/50 full synthetic oil (as specified for your ES 350F)
    • Double-check the oil level at the sight glass – oil should sit just above the center of the circle when the bike is upright and level.
  • 6. Refit the oil fill cap and check for leaks:
    • Start the engine and let it idle for a minute. Shut down, wait a moment, then recheck oil level.
    • Carefully inspect around the oil filter cover and drain bolt for any leaks.
  • 7. Dispose of old oil responsibly:
    • Take used oil and filter to a recycling center. Never pour it down a drain or on the ground.

Model-Specific Call-Outs for GAS GAS ES 350F (2025)

  • Oil Capacity: The ES 350F (and its EX/MC 350F siblings) requires precisely 1.0 liter of oil during each change
  • Torque Specs: Use a torque wrench – oil filter cap bolts are low-spec (approx. 7.4Nm); overtightening can strip threads or damage seals.
  • Washer: Always replace the aluminum crush washer at each oil change to ensure a leak-free seal.
  • Oil Change Interval: Service oil every 15 engine hours if ridden hard or competitively, or refer to your service manual for specific usage guidelines.
  • Shared Platform: The engine oil change process is the same as the 2021-2024 MC 350F, EX 350F, and shares similarities with the KTM 350 EXC-F and Husqvarna FE 350 platforms.

Additional Pro Tips

  • Applying a small dab of grease to the new crush washer and oil filter sealing ring helps ensure a perfect seal.
  • If you ride in extreme conditions, inspect the oil for unusual debris and consider shortening change intervals.
  • Consult your service manual for confirmation of torque specs and assembly diagrams each time.

Changing your 2025 GAS GAS ES 350F oil is straightforward, but attention to detail and the right parts (and torque spec.) are essential for a flawless, long-lasting result. For all your OEM kits and premium lubricants, trust MotoSport.com for the correct fit and fast shipping.

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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.