I just had my car in to have it checked for oil leaks - and the mechanic I take my car to thought it was from the distributor, where it goes into the cam. There is a leak there, with a drip just hanging there most of the time, at the base of the distributor (lowest point, where the oil drips from). They replaced the o-rings and did some sealing, but it still leaks, and I am not convinced that is the only place oil is leaking from. Can you suggest a systematic way to check for the sources of oil leaks? It is a frustrating process. The leak is not catastrophic, just about a 2" circle of oil on the garage floor in the morning each day, but enough to give me concern.

Thanks.