i previously asked a question about detecting an oil leak, and i received an answer. i narrowed down the problem: the leak occurs only immediately after or while warming engine. i looked around the valve cover and the timing belt cover, but i didn't see any wetness. i checked behind the oil pan ( Laying down in the front of car), and felt wetness at the seam where the valve cover is bolted to the block. so i suspect that it required a new pan gasket. But i need your professional input. thank you.