✅ Recommended Oil (Best Choice)

Yamalube 4M 10W-30 Marine Engine Oil

  • Designed specifically for Yamaha 4-stroke outboards
  • Handles high RPM, saltwater corrosion, and marine moisture
  • Fully approved by Yamaha and keeps your warranty happy

👉 This is what Yamaha expects you to use in the Yamaha F150.

✔️ Acceptable Alternatives

If Yamalube isn’t available, you can use:

  • SAE 10W-30
  • FC-W certified marine oil (very important)

Look for:

  • NMMA FC-W certification
  • Labeled for 4-stroke marine engines

🚫 Do NOT use automotive oil (even full synthetic car oil). Marine engines operate very differently.

🛢️ Oil Capacity (Yamaha F150)

  • ~4.5 quarts (4.3 liters)
  • Includes oil filter change

Always check the dipstick after running briefly, engine level, trimmed down.

⏱️ Change Interval

  • Every 100 hours or once per year
  • Or more often if you do:
    • Short trips
    • Lots of idling
    • Saltwater use (your NC ICW runs definitely count)

Pro Tip (from your setup)

Since you’re running a Robalo R202EX with a Simrad GO, this is a great engine to keep meticulously maintained—clean oil = smoother running, better fuel economy, and longer engine life.