My g/f's V6 had something that sounded like pinging from the engine. When she took it in, they said said there was a leak at/in the exhaust manifold. I'm not sure what they did (she couldn't repeat what the dealer told her), but when she got it back, it was fixed.
if the dealer can't find it on your car, take it to another dealer. Some/all dealers will also have small microphones they can attach to different points in the car to determine where the noise is coming from.
Also, I run 5/30 Mobil 1 synthetic in my 98 GT and she's be beautiful for her 75k miles so far. (knock on wood!)
Good luck
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