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Black oil on floor

rscharfe

Member
1987 Mercury 45 hp Classic 50

1987 Mercury 45 hp Classic 50 is dripping thick black oil from behind prop. After removing prop found oil only to be on the bottom. Top and sides were perfectly dry and free of oil. It has never dripped before and I was wondering if a long day of trolling at idle speeds may have caused this. Do I need to be concerned or is this normal??
 
Sounds normal - sustained low

Sounds normal - sustained low speed operation results in a significant build up of burnt/unburnt oil in the exhaust housing. It has nowhere to go but down and out the hub....
 
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