I read somewhere that synthetic oil attacks gaskets. I have been using a synthetic in our '95 Lumina and have noticed an oil seepage at lower part of engine. Synthetic may have nothing to do with this. Just wanted to hear about some of your experiences. Thanks

Good quality synthetics do NOT attack gaskets or seals. That old wives tale came from the folks that had old gummed up engines with tons of miles on them using petro oil. The seals and gaskets developed minor cracks in them, but the oil varnished up under heat and more or less filled the cracks.
Syns come along with better detergent ability and cleaned out the petro varnish and the leaks came back. Just snug up your pan or valve cover bolts, they might be loose. If its a high mileage car, the above scenerio might apply and if it leaks too much, change the gaskets or try the old petro oils to plug em up again.
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