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I have a 2006 987S.
I live in the Chicago area too.
About 32,000 miles.
Winter hibernation.
Been using Red Line 5W40 since about 7,000 miles with excellent results (Blackstone oil analysis).
I take my car to the dealership but bring my own oil.
No tappet noise or tensioner noises here.
I am going to run Mobil 5W50 (hard to find) when I do my year-end oil change in October 2010.
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