My brother in law had 11,000 hours on his 1985 sportcraft 250 fisherman when he retired from chartering in 2005. Never had the motor apart. Rebuilt the outdrive 4 or 5 times but never rebuilt the motor. Changed the oil faithfully. I mated for him (Witch charter and guide service) out of salmon country marina, before i became a charter captain so i have first hand knowledge. Sent from my SM-G973U using Lake Ontario United mobile app