First post on this forum but I'm looking for some help. On the right side of the motor, upper left of the head looking from the side, there is a fitting that looks like a plug. It's round, has a slot across with a hole sunk into the middle, and set slightly into the side of the head. I have an oil leak around the edge of this "plug". I haven't been able to determine from the diagrams of the head what this is. I tried to look for a gasket behind it that might be leaking but the thing won't budge. Actually broke two impact drivers trying to get it loose (yes it was turning the correct direction assuming it isn't reverse threaded:excuseme: ). Anyone have any suggestions? I've been loosing a half quart over about 300 miles.