Join Date: Feb 2011
Location: San Francisco Bay area
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Re: Mercury 4hp four stroke first use report oil overheat.
I used a 10w40 semi-synthetic in my Tohatsu 3.5, because I had a bottle handy, nothing terrible happened.
You can use a cylindrical, concave, flushing attachment - aka a bucket. As long as it covers the cooling water intake, and you don't put the engine in gear, it will suffice!
I gave up on finding a flushing attachement that fits my Yamaha 8, use a bucket instead.
Bristol 31.1, San Francisco Bay