Honda BF40D Owner's Manual page 77

When you check the oil level with the dipstick, you might notice the engine oil
appears milky or the oil level has increased. If you notice either condition,
change the engine oil. See the following table for an explanation of these
conditions.
Operating Method
Running the engine below
3,000 rpm for more than
30% of the time so the
engine does not warm up.
Frequent starting and stop-
ping without allowing the
engine to warm up.
Result
• Water condenses in the
engine and mixes with the
oil, resulting in a milky
appearance.
• Unburned fuel mixes with
the oil, increasing the vol-
ume of oil.
SERVICING YOUR OUTBOARD MOTOR
Effect
The engine oil deteriorates,
becomes less efficient as a
lubricant, and causes an
engine malfunction.
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