How to Change the Oil in a 2008 KTM 105SX: Complete Guide
Shop parts for a 2008 KTM 105SX Dirt Bike.
Regular oil changes are essential for keeping your 2008 KTM 105SX running at peak performance. This detailed guide, proprietary to MotoSport.com, walks you through the process step-by-step. We specify the tools needed, provide crucial tips, and highlight important model-specific details to ensure a hassle-free oil change.
Tools & Supplies Needed
- Socket wrench set (including T-handle, 13mm or the correct size for your drain bolt)
- Torque wrench (capable of measuring 20 Nm / 14.8 ft-lbs)
- Oil drain pan
- Funnel
- New engine oil (Motorex Cross Power 2T or as recommended; 0.8L capacity for 2008 KTM 105SX)
- New crush washer for drain bolt
- Clean rags
- Rubber gloves (recommended)
- Pliers (for snugging the oil fill cap)
Important Model-Specific Advice
- Only change oil when the engine is warm (not hot, just warmed up), as this helps it drain more completely and mixes up any particles.
- The recommended oil quantity for the 2008 KTM 105SX is 0.8 liters (800cc). Overfilling or underfilling can cause damage.
- Motorex is KTM's recommended oil brand. Using low-quality oil or the wrong amount can lead to premature engine wear.
- Always replace the crush washer to avoid leaks after reinstallation.
- Dispose of oil properly at a recycling facility.
Step-by-Step Oil Change Instructions
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Preparation
- Start your bike and let it idle for a few minutes to bring the engine to operating temperature, then shut it off.
- Place the bike upright and secure it on a stand to keep it stable for the duration of the oil change.
- Gather all tools and materials so nothing interrupts your workflow.
- Wear gloves and have rags handy to clean up any mess.
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Remove the Oil Fill Cap
- Locate the oil fill cap on the right side of the engine. Remove it and set it aside. This allows oil to drain more smoothly.
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Drain the Old Oil
- Position your drain pan beneath the engine's drain bolt. The bolt is usually found on the left-side lower part of the crankcase.
- Using the socket wrench (with T-handle if preferred for better control), loosen and remove the drain plug. Be careful not to strip the bolt and avoid dropping it into the oil pan as oil will be hot.
- Allow the oil to drain completely (this may take several minutes).
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Clean the Magnetic Drain Plug
- Inspect and clean the magnet on the drain plug. Some metal particles are normal; excessive debris could indicate internal engine wear.
- Replace the old crush washer with a new one.
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Reinstall the Drain Plug
- Screw the drain plug back in by hand to avoid cross-threading, then use a socket wrench to snug it down.
- Set torque wrench to 20 Nm (14.8 ft-lbs) and tighten to the proper specification.
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Add New Oil
- Place a funnel in the oil fill opening and pour in 0.8 liters (800 cc) of high-quality two-stroke gearbox oil (Motorex or equivalent).
- Allow oil to settle for a minute, then check the level per the engine's sight glass or dipstick, if equipped, according to the owner's manual instructions.
- Reinstall the oil fill cap, using pliers for an extra snug fit, as recommended by KTM.
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Check for Leaks & Final Steps
- Start the engine and let it idle for a minute. Shut it down and inspect the drain plug and area below for leaks.
- With the engine off and slightly cooled, double-check oil level and top off if needed (do not overfill).
- Wipe down any spilled oil and properly recycle old oil and washers.
2008 KTM 105SX Owner Call-Outs
- Always use the correct oil grade and quantity for this model: 0.8L Motorex (or equivalent) two-stroke gearbox oil. Double check on the owner's manual or technical bulletin for any running updates or rare variations.
- Check and clean the oil screen during scheduled maintenance or if experiencing shifting issues.
- Inspect and replace the drain plug crush washer every time. This is a common source of oil leaks if omitted.
- Regularly check and clean around oil plug, ensuring no dirt falls into the case during oil changes.
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Keep your KTM 105SX running strong with regular oil changes and genuine parts.
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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.