Mercury 75 OptiMax Owner's Manual page 50

4. Oil filler caps with a dipstick ‑ Check the oil level on the
dipstick. The first set of holes indicates 0.94 liters (1 US qt)
low. The second set of holes indicates 1.89 liters (2 US qt)
low. The third set of holes indicates 2.83 liters (3 US qt) low.
a - Add 0.94 liters (1 US qt)
b - Add 1.89 liters (2 US qt)
c - Add 2.83 liters (3 US qt)
5. Oil filler caps with a chain ‑ Check the oil level on the chain.
The first ball marker indicates 0.94 liters (1 US qt) low. The
second ball marker indicates 1.89 liters (2 US qt) low.
a - Add 0.94 liters (1 US qt)
b - Add 1.89 liters (2 US qt)
6. Slowly fill the oil tank with the specified oil. Do not overfill.
Add only enough oil to bring the oil level up to the bottom of
the fill neck.
FUEL AND OIL
a
b
c
a
b
40
37143
37146
eng