How to Change the Oil in a 1994 Suzuki DR350S

The 1994 Suzuki DR350S is a classic dual-sport with a dry sump oiling system. This makes oil changes a bit different than most other dirt bikes that use a wet sump. Follow this guide to perform a full oil and filter change safely and efficiently, with special attention to the DR350’s unique features.

Tools and Materials Needed

  • 17mm, 12mm, and 10mm wrenches
  • 19mm socket
  • 8mm socket (optional, for some filter covers)
  • Needle nose pliers
  • Screwdriver
  • Drain pan
  • 2 quarts of 10W40 motorcycle oil
  • New oil filter (OEM #16510-37440 or equivalent)
  • New drain plug crush washers
  • Clean rags
  • Box of gloves (optional, but recommended)

Preparation

  • Warm up the engine for several minutes to thin the oil for easier draining.
  • Turn off the bike and ensure it is on a secure stand with plenty of working space.
  • If doing a complete oil and screen change, remove the skid plate by unscrewing the four 12mm bolts (two on each side of the plate).

Draining the Oil

  • Locate the crankcase drain bolt on the bottom of the engine. Use your 17mm wrench to loosen and remove this bolt. Allow oil to fully drain into your catch pan. Replace the crush washer if needed.
    Tip: There’s no separate oil pan in the DR350, just the crankcase bottom – do NOT over-tighten the drain bolt to avoid damaging the threads.
  • Locate the frame (dry sump) oil drain bolt; this is generally near the front frame downtube. Remove this with your 12mm wrench and drain the frame reservoir fully. Replace the crush washer here as well.

Oil Filter and Oil Screen Service

  • On the right side of the engine, find the oil filter cover. Remove the bolts (often 8mm) and pull the cover off. Gently remove the old oil filter with pliers. Check the orientation and note any springs or gaskets – install the new filter the same way.
  • If doing a full service, locate the oil screen (inside the frame or near the frame reservoir). Remove, clean, and inspect for debris or metal particles. Reinstall or replace if damaged.

Button Everything Up

  • Reinstall and tighten the crankcase and frame drain bolts using new crush washers.
  • Put the oil filter cover back on. Ensure the O-ring or gasket is seated properly to avoid leaks.
  • Reattach the skid plate if removed.

Refilling with New Oil

  • Add 10W40 motorcycle-specific oil through the oil fill cap (usually on top of the frame or near the head tube). The DR350S typically needs about 2 quarts total, but pour in less and check the level.
  • With the dipstick (usually on the frame oil tank), check the oil level. The bike should be upright and on level ground, not leaning on the side stand.
  • Kick the engine over a few times by hand (ignition off, use the decompression lever) to circulate the oil throughout the system before starting.
  • Start the bike and let it idle for a few minutes. Shut off and recheck the oil level, adjusting as needed.

Final Checks and Tips Specific to the 1994 DR350S

  • The frame holds part of the oil supply; always check both the engine and frame drains during an oil change to fully remove old oil.
  • You do not need to remove the skid plate for basic drain-and-fill, but for full screen and frame draining, plate removal is best.
  • Replace all crush washers at each drain plug to prevent leaks.
  • Oil capacity may vary slightly if the motor or tank aren’t fully drained—pour oil carefully and check level frequently.
  • If you’re unfamiliar with oil screens or your bike hasn’t had a full service in a while, take the extra step to inspect screens for peace of mind.
  • Always use a high quality motorcycle-specific oil; automotive oils can cause clutch slippage.

Common Mistakes to Avoid

  • Over-tightening bolts and stripping soft aluminum threads; torque to factory specs.
  • Neglecting to clean/reinstall the oil screen or forgetting crush washers can lead to leaks and internal engine issues.
  • Checking oil with the bike on the side stand will give a false low reading; always check upright.

Conclusion

Changing the oil on your 1994 Suzuki DR350S is straightforward with the right tools and steps. Paying attention to the DR350’s unique dry sump layout, replacing all crush washers, and caring for the filter and screens will keep your dual-sport running for years. For all the supplies and parts needed for your DR350 or expert gear and information, visit MotoSport.com.

Related Shopping Categories

Shop Motor Oil for a 1994 Suzuki DR350S Dirt Bike.

Shop Oil Filters for a 1994 Suzuki DR350S Dirt Bike.

Shop Oil Drain Pans for a 1994 Suzuki DR350S Dirt Bike.

Shop Tools for a 1994 Suzuki DR350S Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 1994 Suzuki DR350S Dirt Bike.

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.