How to Change the Oil in a 2025 KTM 350SXF: Complete DIY Guide

Shop parts for a 2025 KTM 350SXF Dirt Bike.

Consistent maintenance is essential for peak performance and durability of your 2025 KTM 350SXF. Changing the engine oil as recommended keeps your bike running strong and prevents premature engine wear. This guide, proprietary to MotoSport.com, walks through the exact process and details every tool and trick you'll need for this specific KTM model year.

Tools & Materials Needed

  • 13mm socket
  • 8mm socket
  • Pliers
  • 13mm wrench
  • Drain pan
  • Brake cleaner or similar solvent
  • Paper towels
  • Small plate or tray for parts
  • New oil filter (recommended with every change)
  • New crush washer for drain bolt
  • Torque wrench (optional but ideal)
  • 1,000 mL (1L) of 10W50 Motorex full synthetic oil
  • Rubber gloves (recommended)

Step-by-Step Instructions

  1. Prepare Your Bike and Work Area
    • Start and let your bike idle for 30-60 seconds. This slightly warms the oil, making it flow out more easily and taking contaminants with it. However, you can perform the oil change cold if you prefer to avoid possible burns; both methods are acceptable for this generation of KTM 350SXF.
    • Shut off the engine and place the bike securely on a stand.
  2. Gather Tools and Oil
    • Ensure all tools and materials listed above are within reach before you begin.
  3. Drain the Old Oil
    • Locate the 13mm drain bolt on the bottom of the engine case (right side, rear bottom of the case).
    • Place your drain pan under the drain bolt.
    • Using the 13mm socket or wrench, carefully loosen and remove the drain bolt. Be cautious—oil may flow quickly and can be hot if the engine was just run.
    • Allow oil to fully drain. Tilt your bike gently (if safe and needed) to ensure thorough draining.
    • Remove and replace the crush washer on the drain bolt before reinstalling it.
  4. Remove and Replace the Oil Filter
    • Locate the oil filter cover on the right side of the engine.
    • Remove the oil filter cover bolts (typically 8mm or T45, check your specific bike fastener) and the cover.
    • Carefully pull out the old oil filter–note its orientation.
    • Lubricate the new filter's O-rings with a bit of fresh oil and insert it in the same orientation as the original.
    • Clean the filter cover and mating surfaces, then reinstall it with the bolts to the manufacturer's torque spec (or hand snug if no torque wrench).
  5. Install the Drain Bolt
    • Wipe the area around the oil drain hole clean.
    • Reinstall the drain bolt with a new crush washer. Tighten to KTM's recommended torque specification (typically 15 Nm–consult your owner's manual for confirmation).
  6. Add New Oil
    • Remove the oil fill cap located on top of the engine.
    • Pour in 1,000 mL (1L) of 10W50 Motorex full synthetic oil. Use a funnel to avoid spills.
    • Reinstall the oil fill cap securely.
  7. Prime the Engine
    • Without starting the bike, tap the start button a couple of times to cycle oil through the system—do not start the engine yet. This gets oil circulating through the passages and into the new oil filter before the first start after the change.
  8. Run and Check for Leaks
    • Start the bike and let it idle for 20-30 seconds.
    • Shut off the engine and let it sit for a minute or two to allow the oil to settle.
    • Check for leaks at both the drain bolt and oil filter areas. Wipe up any stray oil to inspect thoroughly.
    • Verify oil level via the oil sight glass: level should be between the two red dots when the bike is upright. If too high or low, adjust as necessary by draining or adding oil.
  9. Clean Up and Dispose of Old Oil Properly
    • Wipe down any oil residue and reinstall the skid plate if you removed one.
    • Return all tools and properly dispose of the drained oil and filter at a local recycling center.

2025 KTM 350SXF-Specific Callouts

  • New Generation Frame/Engine: The 2023–2026 350SXF uses the same platform, so the steps and tool sizes above apply directly to all of these model years.
  • Oil Capacity & Type: 1,000 mL of 10W50 Motorex full synthetic is the factory-recommended oil type and amount.
  • Crush Washer: Always replace the drain bolt's crush washer to prevent leaks—these are included in many KTM oil change kits.
  • Priming the Engine: After filling new oil, always prime the oil passages by cranking (not starting) the bike a few times using the starter button.
  • Oil Filter Orientation: Ensure correct installation direction specific to the 350SXF filter–refer to the original orientation before removal.
  • Check the Sight Glass: The 350SXF features an oil level sight glass. Level should be halfway up the red circle after the bike has sat for a couple of minutes post-startup. Adjust oil amount if needed.

Follow these procedures every 3-5 engine hours (more often for high-performance or racing use) to keep your KTM 350SXF running at its best, and always consult your owner's manual for the most current torque and service specifications for your 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.