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Hey Guys, I recently purchased a '89 25 ft. GW w/twin 200 yamahas. Upon runing each engine in a 55 gal drum for about 20 minutes with water being constantly replenished I found the lower unit and drum to be covered with a black exhaust like oily mess. Upon draining the drum, a considerable amount of oily sludge drains through the prop. After pulling off the prop I can see that the oily mess is coming from above, down the exhaust part of the housing. There is no oil visible where the exhaust comes out below the power head. Both engines do the same thing. I am at a loss. Any ideas are appreciated. Thanks Keith