FUEL AND OIL
40
NOTE: Under certain conditions, the operating temperature of
4‑stroke outboard engines may not get hot enough to evaporate
the normal fuel and moisture that accumulate 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. This additional fuel and moisture
that collects in the crankcase eventually ends up in the oil sump
and will add 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, Mercury recommends that
the oil and filter be changed regularly following the oil change
interval and using the recommended oil quality. It is further
recommended that if your outboard is operated frequently in the
conditions described above, that more frequent oil change
intervals be considered.
6. Push the dipstick back in all the way.
7. Reinstall the oil fill cap hand‑tight.
8. Reinstall top cowl.
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