I have a '79 Evinrude 15hp model #15904E that I got at the end of last summer. I have run it on my Avon inflatable once and noticed quite the oil slick around the exhaust when i was at the boat launch and then when i flushed it at home also noticed some gunk/sludge dripping out of the exhaust as well. I drained the gear case and the oil did not look to have water in it. Is the oil slick/sludge normal for a 2 stroke engine? I am also about to order an impeller and will replace that, the water ports were shooting out plenty of water, but who knows when the impeller was last changed.
