How to Change the Oil in a 2026 Beta 390 RS

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The 2026 Beta 390 RS is known for its reliable performance, thanks in part to its robust separate engine and transmission lubrication systems. Keeping both sides fresh with the correct oil volume is essential for smooth shifting, engine protection, and maximizing the dual-sport's long-term value. This step-by-step MotoSport-exclusive guide walks you through the oil change procedure – tailored to the specifics of the latest 390 RS model.

Tools & Supplies You'll Need

  • 8mm socket or Allen key
  • 13mm socket
  • Oil catch pan
  • New oil filter (Beta OEM-recommended for 2026 390 RS)
  • Replacement o-rings (for oil filter cover & drain bolts)
  • Recommended oil: 10W-50 full synthetic (minimum 1.5L)
  • Torque wrench
  • Clean rags

Step 1: Warm Up & Prep

Start the bike and let it idle for 2–3 minutes. Warming the oil ensures a thorough drain-out for both engine and transmission. Shut off the bike, cool for a minute, then place it securely on a stand. Remove the skid plate to access the drain bolts and oil filter cover.

Step 2: Remove the Oil Filter

  • Use the 8mm tool to remove both bolts on the oil filter cover.
  • Carefully remove the cover – be ready for some oil run-off.
  • Take out the oil filter and old cover o-ring. Leave the filter cavity exposed, this helps both chambers drain fully. Discard the old o-rings.

Step 3: Drain the Oil

  • Position your oil pan underneath the engine.
  • Remove the engine oil drain bolt with your 13mm socket and allow it to drain fully.
  • Locate and remove the transmission oil drain bolt next, draining that chamber completely.

Step 4: Reinstall Filter and Bolts

  • Install a fresh oil filter – open end faces the engine, solid end faces outward.
  • Lubricate and fit the new o-ring on the filter cover. Reinstall and torque the oil filter cap to 10 Nm.
  • Install new o-rings on both drain bolts. Reinstall and torque: engine drain bolt to 15 Nm and transmission drain bolt to 20 Nm.

Step 5: Add Fresh Oil

  • Remove both the engine and transmission oil fill caps.
  • Pour 750mL 10W-50 full synthetic into the engine side, and another 750mL into the transmission side. Use only oil rated for high-performance four-strokes.
  • Replace oil filler cap o-rings with new ones if available. Reinstall and tighten both filler caps.

Step 6: Final Checks & Notes for the 2026 390 RS

  • Start the bike. Let it idle 2 minutes, then turn off.
  • For the 390 RS, engine oil should be checked with the engine running – confirm the oil level is centered in the sight window. Transmission oil is checked with the bike off and the oil at the base of the check bolt threads.
  • Beta recommends first oil and filter change after just 3 riding hours for break-in, then intervals as detailed in your owner's manual.
  • This model features separate chambers – never mix engine and transmission oil types or quantities.
  • Always use quality o-rings and tighten to spec. Leaks at drain bolts or filter cover are common when reusing old o-rings or over-torquing.

Your 2026 Beta 390 RS is now ready for the trail again. Protect your investment: keep up with regular oil changes – it's the simplest way to ensure performance and longevity on this high-revving dual-sport platform.

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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.