ky;
Now that you've read all the rotten things everybody had to write about your "mechanic", here is some (hopefully slightly more) constructive help...
In addition to the rear seal (which if the cause will result in oil dripping out of the drain hole at bottom of bell housing), there's additional oil plumbing which may be leaking...some things to check: the lines and fittings leading to the oil pressure gauge...PCV system (previously mentioned)...old style "pancake" heat exchanger/cooler located under the oil filter (if fitted)...
With all of the air blowing around the engine compartment while on the road (especially at 90mph) any leakage will be blown all over the place...so I suggest you look around and try to locate the oily area, wipe the area which is oily, and if it is not obvious from where the oil is leaking, start and run the engine for a couple of minutes to make pressure, shut off, and carefully look around again for the source...
Good Luck
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