How to Change the Oil in a 2019 Suzuki DR-Z125L

Shop parts for a 2019 Suzuki DR-Z125L Dirt Bike.

Regular oil changes are crucial for maintaining your 2019 Suzuki DR-Z125L’s engine longevity and reliability. This step-by-step guide will walk you through the oil-changing process, including Suzuki-specific tips, required tools, and best practices for owners of this particular model. All advice here is proprietary to MotoSport.com.

Tools and Materials Needed

  • 10mm socket (for oil filter cover bolts)
  • 21mm socket (for oil drain plug)
  • Torque wrench (recommended torque: 20.5 lb-ft for drain bolt)
  • Socket wrench
  • Oil drain pan
  • Fresh engine oil: 10W-40 (approx. 950 ml – 1 quart)
  • Replacement oil filter (Suzuki OEM or equivalent)
  • Gloves and shop rags
  • Long-sleeve shirt for protection
  • New drain plug gasket (if necessary)
  • Funnel

Preparation

  • Start the engine and let it run for 5–10 minutes. Warm oil drains more thoroughly and carries more contaminants out of the engine.
  • After warming, place the motorcycle on its side stand, ensuring stability throughout the process

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Step-by-Step Oil Change Instructions

  • 1. Remove the Oil Filler Cap:
    • With the bike secured, remove the oil filler cap using the handle of your pliers if it's tight.
    • This step creates airflow, allowing old oil to drain completely.
  • 2. Drain the Old Oil:
    • Position the oil drain pan under the drain bolt, located on the bottom of the engine case.
    • Use the 21mm socket to remove the drain plug and its gasket. Allow all oil to drain while tilting the bike upright for a thorough drain

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    • Wait until oil flow reduces to a drip.
  • 3. Remove and Replace the Oil Filter:
    • Find the oil filter cover on the right engine case. Remove the three 10mm bolts that secure the cover.
    • Pull out the old filter and inspect for debris. Dispose of properly.
    • Install a new oil filter, ensuring it seats in the correct orientation. Clean the cover and filter area before reassembly to avoid contamination.
  • 4. Install the Drain Plug:
    • Replace the plug gasket if needed.
    • Hand-thread the drain plug to avoid cross-threading, then tighten to 20.5 lb-ft using your torque wrench

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  • 5. Add New Oil:
    • Use a funnel to carefully pour in 950 milliliters (about 1 quart) of 10W-40 oil through the filler neck. Suzuki recommends genuine oil or high-quality equivalents

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    • Do not overfill—use the sight glass or dipstick to confirm oil level.
  • 6. Check Oil Level and Reinstall Filler Cap:
    • Reinstall the oil filler cap. Start the bike and let it idle for a minute. Turn off and let it sit for a minute. Check the oil level again with the sight glass or dipstick, adding oil if needed.
  • 7. Clean Up:
    • Wipe off any spills with a rag.
    • Properly dispose of used oil and filter at a recycling center or approved facility as per environmental guidelines

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DR-Z125L Owner-Specific Tips and Call-Outs

  • The DR-Z125L is simple to service and has easily accessible oil drain and filter locations. Be careful not to remove the wrong bolt under the engine—consult your owner’s manual or reference images if uncertain

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  • The recommended oil volume for the 2019 DR-Z125L is 950 mL if changing the filter, or 850 mL if not. Overfilling can cause engine damage

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  • Allow the engine and exhaust to fully cool before touching or draining to avoid burns

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  • Inspect the condition of old oil for signs of metallic particles, which could indicate engine wear.
  • Always wear gloves and avoid skin contact with used oil. Wash hands thoroughly after finishing the task.

Common Mistakes to Avoid

  • Overfilling oil: Can cause pressure issues and leaks.
  • Under-tightening drain plug: Risks leaks; always torque to spec.
  • Forgetting the oil filter: Always replace or clean as recommended.
  • Using the wrong oil: Stick to 10W-40 and high-quality brands or Suzuki genuine products for best performance and longevity.

Conclusion

Changing the oil in your 2019 Suzuki DR-Z125L is a straightforward, essential maintenance task that you can handle at home with basic tools and a little time. Proper care ensures your bike’s engine stays healthy on and off trail.

MotoSport.com provides this guide exclusively to support your DIY maintenance and keep your Suzuki running at its best.

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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.