How to Change the Oil in a 1987 Suzuki DR125

Shop parts for a 1987 Suzuki DR125 Dirt Bike.

A MotoSport.com Proprietary Guide

Keeping your 1987 Suzuki DR125 running strong requires regular oil changes to maintain engine health and performance. This step-by-step guide covers everything you need to know for a complete and safe oil change, including the required tools, supplies, safety notes, and specific callouts for this iconic model.

Tools and Supplies Needed:

  • Socket wrench set (to fit drain plug and oil filler cap)
  • Oil drain pan
  • Rags or paper towels (for cleanup)
  • Gloves (nitrile or dishwashing recommended)
  • Replacement oil filter (OEM or equivalent; check for compatibility)
  • New engine oil (API SF or SG, SAE 10W-40 recommended, capacity 0.85 L or 0.9 qt for typical oil changes)
  • New drain plug gasket (recommended for a leak-free seal)
  • Funnel
  • Torque wrench (for proper drain plug tightening; torque spec: 28 N–m/20.5 lb-ft)

Safety Precautions:

  • Wait until the engine is warm, but not hot, before changing oil. This helps oil drain thoroughly, but avoids burns from hot engine parts .
  • Wear gloves and long sleeves to minimize contact with used engine oil, which can be harmful after prolonged exposure .
  • Keep oil and used filters away from children and animals. Dispose of all fluids and used filters in accordance with local regulations .

Steps to Change the Oil:

  1. Prepare the Bike:
    • Warm up the engine for a few minutes, then shut it off and allow it to sit for 5-10 minutes to cool slightly and let the oil settle.
    • Place the motorcycle on level ground and hold it vertically, or use a stand.
    • Clean the area around the oil filler cap and drain plug to prevent dirt from falling into the engine during oil change .
  2. Drain the Oil:
    • Place an oil pan under the engine's drain plug.
    • Remove the oil filler cap to allow air in and oil to drain smoothly.
    • With a socket wrench, carefully unscrew the drain plug and gasket. Allow all old oil to fully drain out while keeping the bike upright .
    • Wait several minutes for complete drainage.
  3. Replace or Clean the Oil Filter:
    • Remove the oil filter cap. Note: On the DR125, the filter is located behind a cover on the right side of the engine (refer to your owner's manual for exact placement) .
    • Take out the old oil filter; inspect it for debris or metal shavings (which could be a sign of engine wear).
    • Clean the oil filter area—ensure no foreign material enters the engine .
    • Install the new (or cleaned, if reusable) filter, making sure it's properly seated.
    • Reinstall the oil filter cover and tighten bolts evenly.
  4. Install the Drain Plug:
    • With a new gasket (recommended), reinstall the drain plug. Tighten to 28 N–m (20.5 lb-ft) using a torque wrench to avoid over- or under-tightening .
  5. Refill the Engine with Fresh Oil:
    • Using a funnel, pour in new engine oil (API SF/SG, SAE 10W-40 recommended). The engine will take about 0.85 liters (0.9 quarts) for a standard oil change without filter replacement. If you've replaced the filter, check your manual—sometimes slightly more oil is needed .
    • Install the oil filler cap securely.
  6. Check for Leaks and Proper Level:
    • Start the engine and allow it to idle for a few minutes. Watch for leaks at the drain plug and around the oil filter area.
    • Shut off the engine. After three minutes, check the oil level through the oil sight glass or dipstick. Add oil as needed until it's at the correct level .

Special Model Callouts: 1987 Suzuki DR125

  • This model does not have a paper drop-in oil filter; it uses a screen filter, which should be cleaned rather than replaced if your bike is original. If upgraded, OEM or compatible aftermarket filters can be used .
  • Always use the specified oil type and capacity. Overfilling can cause engine damage, while underfilling risks inadequate lubrication .
  • Inspect for drain plug gasket wear or cracking each oil change to avoid persistent leaks .
  • Suzuki recommends oil changes every 6 months or sooner if riding in dusty, muddy, or high-stress conditions .

Final Steps and Disposal

  • Recycle used oil and filters at a certified facility or contact your local waste management service for guidance.
  • Record the oil change and note the mileage for next maintenance.

Changing the oil on your 1987 Suzuki DR125 is straightforward and essential. Follow these steps, stay safe, and ride confidently knowing your engine is protected by quality lubricants and proper maintenance.

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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.