Mercury 5 HP FourStroke Propane Operation, Maintenance And Installation Manual page 27

NOTE: If the oil level is at the add mark, add 100 ml (3 oz) of oil.
a
b
NOTE: Under certain conditions, the engine operating temperature may not
get high enough to evaporate the normal moisture that accumulates in the
crankcase. These conditions include operating at idle for long periods,
repeated short trips, slow speed or quick stop‑and‑go operation, and operating
in cooler climates. Additional moisture that collects in the crankcase eventually
ends up in the oil sump, adding to the total volume of oil that appears on the
dipstick reading. This increase in oil volume is known as oil dilution.
Outboard engines can typically handle large amounts of oil dilution without
causing durability problems. However, to ensure extended life of the outboard
engine, change the oil regularly, following the recommended oil change
interval and using the recommended oil quality. If your outboard is operated
frequently in the conditions described above, consider more frequent oil
change intervals.
3. Install the oil filler cap and tighten securely.
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FUEL AND OIL
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a - Full mark
b - Add mark