1998 integra ls My engine is leaking oil, and it looks like a rubber plug is the problem, but I dont know how to identify the part so that i can get a replacement. It's on the left side of the engine towards the top.. almost directly beneath the valve cover (its not the valve cover gasket). Its a circular black rubber piece that says "P30" on it. Its in line with where the rocker arm assembly attaches to the engine block and it looks like some kind of cap or plug. Thanks to anyone that can tell me what it is.