I had this on my auto and feared the worse (input shaft / torque convertor leak). Luckily, it was the gasket for a hidden blanking plate on the back of the head - I assume in FWD applications, the distributor was mounted here? Anyway, I only realised it was coming from there after it got really bad, so grab a small mirror and have a look. Only held on by 3 bolts, ratchet spanner recommended