Ford Temp 1990

Does anybody know if it is true that older fords happen to have a some what natural oil leak in back of the engine, I've taken my car to my dealer like 6 times for the same thing, first they tightend the bolts and screws and UGGG, then it was still leaking so it was taken back again, then their garage put a new seal on it that cork board looking thing :), which was a messy job there is like an inch or so hanging out, on top of blue silicone hanging out all over the place, and it STILL LEAKS AFTER FIVE TRIPS TO THE SHOP that last one doesn't count because it's till leaks!! It's coming from the last right side of the engine!!
It doesnt seem to be losing oil, and the drips are small but it's driving me crazy cars shouldn't leak ANYTHING right lol.
Ugggggg help