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Bought A 1986 Johnson 60 HP changed the LU,oil the oil was thick and very black.Would it be a good idea too flush it with something ? If so what would be the best stuff to use .
You should have the lower unit pressure and vacuum tested to check out the condition of the seals. They're often a $300 repair item. It's a job for a qualified marine mechanic. They could also tell you the condition of the bearings, gears, etc.
You should be just fine, i just changed out the lu oil on a motor(83' 7.5hp evinrude) I just bought and the oil was pitch-black, heavy, but no water or metal. Shifts&runs fine!
