How to Change the Oil in a 2023 GAS GAS EX 350F: A Complete Guide

Shop parts for a 2023 GAS GAS EX 350F Dirt Bike.

Changing the oil in your 2023 GAS GAS EX 350F is essential for peak engine performance and longevity. Performing regular maintenance, like oil changes, ensures your dirt bike runs reliably on any terrain. This guide is proprietary to MotoSport.com and covers the specific steps, tools needed, and key model-specific call-outs to help you complete an oil change with confidence.

Tools & Supplies Needed

  • Socket wrench set (including 13mm socket for oil strainer)
  • Drain pan
  • New oil filter
  • Measuring cup
  • Fresh engine oil (consult your owner's manual for correct grade and capacity)
  • New crush washer
  • Torque wrench
  • Funnel
  • Contact cleaner
  • Grease
  • Paper towels or rags
  • Needle-nose pliers (for oil strainer removal)
  • Gloves (optional for safety)

Before You Start: Model-Specific Notes

  • For the 2023 GAS GAS EX 350F, oil change intervals are typically every 15 hours of engine use, but many riders perform oil changes more frequently depending on riding conditions.
  • This bike shares its engine platform with KTM and Husqvarna 350 four-stroke models. The oil change process and capacities are very similar across these bikes.
  • Always verify oil capacity and torque specs with your service manual before starting.
  • Make sure the engine is off, and the bike is securely positioned on a stand before beginning work.

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine
    • Start your bike and let it idle for 2–3 minutes to allow the oil to warm up and flow more easily when drained. Do not skip this step, as cold oil drains more slowly and incompletely.
    • Shut the engine off and make sure the bike is stable on a stand.
  2. Remove the Skid Plate (if equipped)
    • If your EX 350F is fitted with a skid plate, remove it to access the oil drain bolt.
  3. Locate and Remove the Oil Drain Bolt
    • Place your drain pan under the engine. Locate the main oil drain bolt under the crankcase.
    • Using your socket wrench, loosen and remove the drain bolt, being careful as hot oil will begin to flow out.
    • Check for the crush washer on the drain bolt; always replace it with a new one to prevent leaks during reassembly.
  4. Drain the Oil Completely
    • Allow all oil to drain fully into your pan. To help remove as much old oil as possible, you can lean the bike side to side once the main flow slows.
  5. Remove the Oil Strainer
    • Using a 13mm socket, remove the oil strainer bolt (usually located near the drain bolt).
    • With needle-nose pliers, gently pull out the oil strainer. Inspect for debris or metal particles that could indicate engine wear. Thoroughly clean the strainer with contact cleaner.
    • Reinstall the cleaned strainer. Lightly apply grease to the new O-ring or gasket if equipped. Do not over-tighten the strainer bolt—consult your manual for exact torque spec.
  6. Replace the Oil Filter
    • Locate the oil filter cover (usually on the right side of the engine). Remove the cover with the appropriate tool.
    • Pull out the old oil filter and discard it. Clean the cover and sealing surfaces.
    • Install the new oil filter. Lightly grease the new O-ring on the cover if present, then reinstall the cover. Torque to manufacturer spec.
  7. Install New Crush Washer & Replace Drain Bolt
    • Attach a new crush washer to the drain bolt and reinstall the bolt. Use a torque wrench to tighten to the manufacturer-specified value.
  8. Refill with Fresh Oil
    • Using a funnel, pour in the recommended type and amount of engine oil (check your 2023 model year owner's manual for the exact capacity; typically just under 1 liter for 350cc four-strokes, but always verify).
    • Pour slowly and do not overfill. Reinstall and hand-tighten the oil fill cap.
  9. Check for Leaks & Final Inspection
    • Start the engine and let it run for a minute, then shut it down and inspect for leaks around the drain bolt, oil strainer, and filter cover.
    • With the bike upright, check the oil level using the sight glass or dipstick as equipped. Add oil if necessary to reach recommended level.
    • Dispose of old oil and filter at an approved recycling center.

2023 GAS GAS EX 350F: Specific Call-Outs

  • Confirm you are using the correct oil viscosity and filter type as specified for the 2023 EX 350F.
  • The oil strainer is an important element on this engine design—never omit inspecting and cleaning it at every oil change.
  • Some 2023 models may have engine cover bolts with factory-applied threadlocker. Replace any single-use hardware as specified in the manual and avoid overtightening any bolts into aluminum engine cases.
  • Follow manufacturer torque specs for the drain plug, filter cover, and strainer bolt to avoid damaging components or causing leaks.

When in Doubt

  • If unsure about any step, always consult your official GAS GAS service manual for the EX 350F.
  • You can contact MotoSport.com's customer service for model-specific advice, OEM parts, or recommended oils and filters for your bike.

Regular maintenance like this is the best way to guarantee optimal performance, reliability, and value for your 2023 GAS GAS EX 350F. Keep riding.

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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.