"I have just drained the oil f
"I have just drained the oil from the gearcase & the oil was black,thick & smelt like coal gas.I will now change it more often.What i'd like to know is can i flush the lower unit & if so what would i use so that i don't damage the seals.Also the motor is about a 1985 8hp merc.could you tell me what spark plugs are the correct ones for this motor please...thanks Warren..."
"I have just drained the oil from the gearcase & the oil was black,thick & smelt like coal gas.I will now change it more often.What i'd like to know is can i flush the lower unit & if so what would i use so that i don't damage the seals.Also the motor is about a 1985 8hp merc.could you tell me what spark plugs are the correct ones for this motor please...thanks Warren..."