How much? A small amount seems to be standard for the I6 engine. It's a seeping valve cover gasket, and most of us don't worry about it much. Clean it out every 50K or so, unless you're getting so much to cause misfires.
What kind of mileage do you have on your TB? When I did my plugs I had the same problem with the number 3 plug. I went to the dealer and they said that they have seen a few of these but there hadnt been enough for a recall, but they replaced the gasket, gave me a loaner, and changed the oil for me... for the low low price of free.:woohoo:
I would consider talking to your dealer about it, if they wont do it, like roadie said, wont really hurt too much unless its causing a misfire.
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