How to Change the Oil in a 2019 Sherco 300SE-R

Shop parts for a 2019 Sherco 300SE-R Dirt Bike.

Regularly changing the oil in your 2019 Sherco 300SE-R is crucial for maintaining peak engine performance and longevity. This guide is tailored specifically for the 2019 300SE-R two-stroke model and highlights unique considerations for this bike. Below, you’ll find a comprehensive, step-by-step procedure, including all tools and tips for a flawless oil change.

Tools & Supplies Needed

  • 17mm socket (for drain plug)
  • 8mm socket (various engine screws and covers)
  • 4mm Allen key (any casing or filter access, as required)
  • Oil drain pan
  • Funnel
  • Clean rags or paper towels
  • New crush washers (recommended for each oil change)
  • High-quality SAE 10W40 transmission oil (750ml)
  • Gloves (to keep oil off your hands)

Key Considerations for the 2019 Sherco 300SE-R

  • Unlike many four-strokes, this two-stroke model uses transmission oil only. Do not attempt to service a traditional engine oil filter; this bike does not have one.
  • The engine requires 750ml of SAE 10W40 oil (not premix). This is separate from the premixed fuel that lubricates the top end.
  • Ensure you use a new crush washer for the drain plug to prevent leaks.
  • Inspect the drained oil for metal shavings—an abundance may indicate gearbox wear.

Step-by-Step Oil Change Procedure

  • Warm up the Bike
    Start and let the engine idle for 3–5 minutes. Warm oil drains more completely, removing more contaminants. Shut the bike off before proceeding.
  • Position the Motorcycle
    Place the bike on a level stand. Set the oil drain pan directly beneath the transmission drain plug.
  • Remove the Fill Cap
    Unscrew the transmission oil fill cap. This breaks the vacuum and allows oil to drain freely.
  • Remove the Drain Plug
    Locate the drain plug beneath the engine (typically 17mm). Use the 17mm socket to unscrew it. Allow all oil to drain completely into the pan.
    • Inspect the crush washer and replace if deformed or worn.
    • Review the drain plug for any large metal particles stuck to it. Small metallic fuzz is normal due to clutch wear, but excessive shavings should be monitored.
  • Reinstall the Drain Plug
    Clean the drain plug and the area around it, fit a fresh crush washer, then reinstall the plug. Tighten to manufacturer specifications. If the torque spec isn’t available, snug plus a quarter turn is standard for drain plugs.
  • Add Fresh Transmission Oil
    Using a funnel, pour 750ml (0.75L) of SAE 10W40 transmission oil into the fill port.
    • Do not overfill. This can cause excess drag and frothing inside the gearbox.
  • Verify Oil Level
    Some models have a sight glass or dipstick. If yours does, confirm the oil reaches the correct mark. If your bike requires a plug-check, ensure oil is level with the lower edge of the fill hole when the bike is upright.
  • Reinstall Fill Cap
    Replace the fill cap and ensure it’s secure.
  • Start and Inspect
    Fire up the engine and let it idle for 2–3 minutes. Check underneath for leaks, focusing around the drain plug. Shut down and recheck oil level, topping off if needed.
  • Dispose of Old Oil Responsibly
    Take used oil to a certified recycling location. Never dispose of oil in the trash or down the drain.

Special 2019 Sherco 300SE-R Call-Outs

  • This model’s drain plug has an aluminum crush washer which should be replaced at each service interval for best sealing.
  • Some transmission covers may have additional screws or access panels for inspection—make sure to reinstall all parts correctly with the torque specified in the manual (if available).
  • Premix fuel (gasoline mixed with 2-stroke oil at 2%) is required for engine lubrication; the transmission only uses straight 10W40 oil, not premix.

Common Questions & Troubleshooting

  • What oil do I use?
    Sherco specifies SAE 10W40 conventional or synthetic oil for the transmission. Do not use oils meant for 4-stroke engines or ATF in place of the recommended type.
  • Can I reuse the crush washer?
    It is best practice to replace it every oil change to ensure a reliable seal.
  • How often should I change the oil?
    Every 10–20 hours of riding or after any deep water crossings for maximum protection.

Changing the oil in your 2019 Sherco 300SE-R is straightforward and can be done in under an hour with basic tools. Routine oil changes are the single best way to ensure long engine life and crisp shifting for every ride. If you have any doubts, seek out your local MotoSport.com dealer for expert service.

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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.