Both the V8 and the V6 is a 2 piece seal. However, I would recommend replacing both.
As far as the oil, in a car, you can't run anything better than synthetic. It doesn't break down and it doesn't cause leaks. Any oil would be leaking. I will tell you this. If the leak isn't bad, they make products that you add to the motor oil that may take care of the problem. Go to a parts store and ask if they have anything specifically made to help with a rear main oil leak.
Remember this. The reason he is telling you that is will be more expensive to replace it if it is on piece is because the trans will need removed. A two part seal can be done with little additional work if he has the right tools. Therefore, don't let him charge you a ton more money. Hell, I can give you the directions for doing it. It is a big job, but if you have some mechanical ablity, and tools, you should be able to handle it.
Let me know if you have other questions.
Joe
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Tuesday, June 8th, 2010 AT 9:32 PM