My L-reg Cinquecento has an oil leak that has coated the back of the engine and the inner driveshaft gaiters etc. Not nice! Looking up at the rear of the engine, one of the manifold studs seems to be very oily, yet the others are dry (see pic looking up at the back of the engine from underneath the car). I thought initially it was a leak from the rocker cover gasket, but as far as I can see above the manifold it's all dry. I wondering what the cause might be? As a side issue, the engine top end itself sounds very metallic and tappety almost as if it's being starved of oil. Could there be a connection? The car hasn't been on the road for some years and whilst I have recently changed the oil and filter, the previous owner neglected the car and I'm sure never serviced it. Is it possible an oilway to the valvegear is blocked and the oil is finding it's way out elsewhere?