Yamaha AR210 2020 Owner's/Operator's Manual page 132

Operation and handling requirements
4-star models
1 Dipstick
(4) Insert the dipstick back into the dipstick
tube completely. Remove the dipstick
again and check that the engine oil level
is between the minimum level mark and
maximum level mark.
3-star models
1 Maximum level mark
2 Minimum level mark
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4-star models
1 Maximum level mark
2 Minimum level mark
(5) If the engine oil level is significantly
above the maximum level mark, consult
a Yamaha Boat Dealer. If the engine oil
level is below the minimum level mark,
add engine oil.
(6) Remove the engine oil filler cap.
1 Engine oil filler cap
(7) Slowly add engine oil.
(8) Wait approximately 5 minutes to allow
the engine oil to settle, and then check
the engine oil level again.
(9) Repeat steps 3–8 until the engine oil is at
the proper level.
(10) Install the engine oil filler cap.
(11) Repeat the checking oil level procedure
for the other engine.
(12) Close the engine hood.
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