Thread: Oil Leak

If you run a Mercury and wind up with 2 cycle oil on the garage floor like I did, a cracked cap on the oil reservoir may be your problem. It's hard to see if you aren't specifically looking for it. This seems to be a fairly common problem. Usually caused by the vacuum breaker valve failing. That valve is a brass T-fitting on the drivers side of the motor. In my case it was because the ground wire for the cap was broken.