Recently, i've been doing all the work on my car because I really don't trust anyone to work on my car from any shop. The information here at 2gnt is excellent and I'm proud to own a 2gnt. So I was looking back on some of the previous work I had done on my car and I found the Camshaft Position Sensor was leaking. I removed it and found the O ring wasn't even seated correctly. This is what you can expect from shops. I went a purchased another O ring earlier today and installed it. No more leak from that area! If the O ring is leaking badily, can it leave large amounts of oil on the ground? After replacing the O ring, I'm down to a small drip now right above the oil filter area which most likely is the Crankshaft sensor.