How to Change the Oil in a 2020 KTM 150SX: A Complete MotoSport.com Guide

Proper oil maintenance is crucial to keep your 2020 KTM 150SX running at peak performance. This guide walks you through the process step by step, including tools required, model-specific tips, and essential safety precautions to help you achieve a clean and effective oil change every time.

Tools and Supplies Needed

  • 8mm socket (for drain plug)
  • T-handle driver or ratchet
  • Oil catch pan (to collect old oil)
  • Clean rags or paper towels
  • Torque wrench (for re-tightening drain plug)
  • New crush washer (optional but recommended every change)
  • Magnet cleaner (magnetic drain plug)
  • Funnel
  • Recommended 2-stroke gear oil (0.8 liters for 150SX)
  • Pliers (to snug oil fill cap)
  • Bike stand (to keep the bike upright and level)
  • Gloves (optional, helps keep hands clean and safe from hot oil)

Step-by-Step Instructions

  • Warm Up Engine–
    Start your KTM 150SX for a few minutes to warm the engine and oil. Warm oil drains faster and removes more contaminants. Always shut off the engine before you begin work and allow parts to cool enough for safe handling.
  • Remove Engine Guard (if equipped)–
    If your bike has an engine guard or skid plate installed, remove it to access the drain plug easily. This ensures you don't spill oil onto the guard or make a mess. 2020 KTM 150SX models have a straightforward guard; use an 8mm socket if removal is necessary.
  • Loosen the Oil Fill Cap–
    Remove the oil fill cap from the right side of your engine. This step allows air into the system, so oil drains out more freely.
    "Begin by loosening the oil fill cap. Taking this off will allow the oil to drain easier."
  • Place Oil Catch Pan and Remove Drain Plug–
    Position your oil catch pan directly under the drain bolt located at the bottom of the engine case. Use your t-handle driver and 8mm socket to loosen and remove the drain plug.
    Be careful—hot oil can burn skin. While loosening, avoid dropping the drain plug into the catch pan.
  • Let the Oil Drain Completely–
    Allow oil to drain until the flow slows to a drip. Tilting the bike back and forth can help release every last bit of old oil, ensuring a thorough change.
  • Clean the Drain Plug and Magnet–
    Clean debris from the magnetic drain plug—a bit of metallic fuzz is normal. Sift out larger pieces, which could indicate engine wear.
  • Replace Crush Washer–
    It's recommended to replace the crush washer on the drain bolt every oil change to ensure a tight, leak-free seal.
  • Reinstall and Tighten Drain Plug–
    Reinstall the drain plug (with the new or inspected crush washer). Hand-tighten, then use a torque wrench set to 20 Nm (14.8 ft-lb) as specified for the 2020 KTM 150SX. Avoid over-tightening, which can damage threads or the case.
  • Fill with Fresh Oil–
    Place a funnel in the oil fill hole and carefully pour in 0.8 liters of KTM-recommended 2-stroke gear oil. Do not overfill; more is not better.
  • Snug the Oil Fill Cap–
    Reinstall the fill cap, and use pliers or firm hand pressure to snug it down. KTM recommends this to keep the cap secure during vibration and rides.
  • Check Oil Level and For Leaks–
    Start the engine and run for 1–2 minutes. Stop the engine, let it settle for a minute, then check around drain and fill areas for leaks. Ensure oil level is correct—top off if needed. Do not ride with leaks or improper oil level.
  • Reinstall Engine Guard–
    If removed, replace the skid plate or guard after ensuring the work area is clean and dry.

KTM 150SX (2020) Specific Call-Outs

  • This is a 2-stroke engine: The KTM 150SX uses separate transmission/gear oil (not engine oil as in 4-strokes). Be sure to use the correct oil grade for transmissions.
  • Oil Capacity: Use exactly 0.8 liters (800 ml) of gear oil.
  • No Oil Filter Change Needed: Unlike 4-strokes, the 2020 150SX has no internal oil filter for the transmission; just drain and refill oil as outlined.
  • Drain Plug Torque Specification: Always tighten the drain plug to 20 Nm (14.8 ft-lb) to avoid overtightening and thread damage.
  • Engine Guard Tip: If your guard is difficult to remove, specialized tools or third-party drain-routing products can help keep oil changes cleaner and faster.
  • Oil Change Interval: Check and replace oil every 5–10 engine hours, or after heavy riding or races, whichever comes first. Follow KTM's maintenance schedule for severe use.

Final Notes and Pro Tips

  • Tighten by Torque Spec: Over-tightening drain plugs can strip threads; always use a torque wrench for accuracy.
  • Inspect Drained Oil: Check for metal shavings or excessive debris, which may indicate internal issues.
  • Dispose Responsibly: Always recycle used oil at your nearest facility.
  • Document: Keep a log of your oil changes (date, hours, oil used) for best bike health and resale value.

For genuine KTM parts and the right transmission oil, trust MotoSport.com for top-quality service and support for your KTM 150SX.

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Shop Oil Fillers and Drain Plugs for a 2020 KTM 150SX 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.