At the suggestion of many on this board I replaced the conventional oil in my 1986 Porsche 930 with Mobil 1 0-50. I have owned this car for years and have always maintained it religiously. It has only 7,000 miles on it. In all the years I've owned the car, it has never dripped even a drop of oil. Shortly after changing to Mobil 1, I started noticing drips and after a few months I had to put a pan under the car to avoid large puddles. Last week I changed back to conventional oil--Delvac 15-40--and the leakes have stopped completely. I would like the protection of synthetic but not at the expense of a flood under my engine. Can synthetic really leak this much on an otherwise tight engine or is something else going on here.