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Message: <blockquote data-quote="airshot" data-source="post: 505259" data-attributes="member: 1183">The only real difference would be extreme high heat, where 10w would hold viscosity better then 5w.  Make the proper change, you should be fine....Checking oil in 4 stroke engines on a boat has always been a challenge.  When I had my I/O it was no different.  I drained my engine, replaced the filter and filled with merc recommended amount of oil.  With my boat sitting in its storage position on the trailer in my barn, I made the mark on the dip stick.  Now I had proper amount of oil and used the mark on my dipstick as the new full mark and only check when the boat is in storage position.  On your little motor, I would drain, then add recomended amount of oil, the find a position the motor will be stored in so you can repeat that position each time you check the oil.</blockquote>