Mercury GO BOLDLY SeaPro 500hp Operation And Maintenance Manual page 36

7. Remove the dipstick and observe the oil level. Add oil as necessary to
reach the target oil level (1/2 to 2/3 above the bottom of the dipstick
crosshatch or ADD mark).
8. Install the dipstick and oil fill cap hand‑tight.
9. Close the hood.
FUEL AND OIL
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