How to Change the Oil in a 2018 KTM 150SX: A MotoSport.com Exclusive Guide
Shop parts for a 2018 KTM 150SX Dirt Bike.
Maintaining the engine oil in your 2018 KTM 150SX is essential for smooth performance, longer engine life, and reliability on the trails or track. Although KTM two-strokes use a simple gearbox oil system, performing routine oil changes keeps your dirt bike in prime condition.
Tools and Supplies Needed
- 8mm or 13mm socket and ratchet (verify the size for your specific drain bolt)
- T-handle wrench
- Torque wrench (capable of low-range settings, down to 14.8 ft-lb or 20 Nm)
- Drain pan for used oil
- Funnel
- Clean shop rags
- Fresh gearbox oil (0.8 liters of high-quality 2-stroke transmission oil, as recommended by KTM)
- New crush washer for the drain bolt (highly recommended for leak-free sealing)
- Pliers for snugging the oil fill cap as recommended
- Gloves (optional, for protection and cleanliness)
Step-by-Step Oil Change Instructions
- Warm up your engine for 3-5 minutes to thin the oil, letting it drain more completely. Avoid excessive heat for safety.
- Stabilize the bike using a center stand or triangle stand on a level surface.
- Remove the oil fill cap. Located on the clutch side of the engine, this helps oil flow freely as it drains. Set the cap aside somewhere clean .
- Place the drain pan beneath the engine's oil drain bolt. The drain bolt is located at the bottom of the engine case, typically near the shift lever or footpeg area .
- Loosen and remove the drain bolt using your socket or T-handle. Be cautious: used oil can be hot after warm-up.
- Allow the oil to fully drain into the pan. Tilt the bike slightly side-to-side to ensure all old oil exits .
- Clean and inspect the drain bolt. Most KTM two-stroke drain bolts are magnetic to catch metallic debris. A small amount of metallic fuzz is normal. Wipe clean with a rag .
- Replace the crush washer with a new one to avoid oil leaks when reinstalling the drain bolt .
- Reinstall the drain bolt. Tighten it lightly by hand, then use a torque wrench to torque the drain bolt to exactly 20 Nm (14.8 ft-lb) .
- Pour in fresh gearbox oil via the oil fill hole. Use a funnel for precision. For the 2018 KTM 150SX, add 0.8 liters (800ml) of recommended oil .
- Reinstall the oil fill cap. KTM recommends snugging the cap with pliers to ensure it doesn't loosen during riding .
- Wipe any spills, check for leaks around the drain bolt and cap, and properly dispose of old oil per local regulations.
2018 KTM 150SX Model-Specific Call-Outs
- Oil Volume: The 2018 KTM 150SX uses 0.8 liters of gearbox oil, less than a full quart .
- Drain Bolt: Ensure proper torque (20 Nm). Over-tightening can strip the soft aluminum threads in the case; under-tightening can cause leaks.
- Drain Bolt Magnet: Light metallic fuzz on the magnetic tip is normal but note any chunks or excessive debris, which could indicate internal wear.
- Oil Fill Cap: Per KTM's recommendation, give the cap a gentle snug with pliers for extra security .
- No oil filter: The 150SX gearbox does not use an oil filter; changing oil regularly is even more important for cleanliness.
Maintenance Tips and Best Practices
- Stay consistent with oil changes every 10-15 hours of ride time or after every few rides in harsh conditions.
- Run the correct type and viscosity of oil, as outlined in your KTM owner's manual.
- Inspect the drained oil for unusual discoloration, particles, or frothiness, which can indicate clutch or transmission issues.
- Keep records of your changes for future service or resale value.
Changing the oil on your 2018 KTM 150SX is a straightforward process that requires just a handful of tools and about 20 minutes. Regular maintenance keeps your ride performing at its best—whether you're railing berms at the track or conquering tough trails. For genuine parts, recommended oils, and all the gear you need, trust MotoSport.com for your next maintenance session.
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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.