mercury75hp
New member
Hi, I need some help with my 1990 Mercury 75hp, it runs rough and smokes even after cleaning fuel tank and fuel line, and changing spark plugs ect. Also there's a lot of gray oil or grease coming out of the lower unit along with the smoke. It won't won't idle at all and trys to race itself up and down in speed when I have it running on the hose. I have a video and some pics of the gray oil. Here is a link to video of the motor running https://www.dropbox.com/s/qd435ytkntpfltm/20190216_130535.mp4?dl=0 And here is the pic of the oil,