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with that many miles and age of the boxster while you're doing plugs you may want to consider replacing the tubes/o rings at the same time. On mine with 51k miles 2 of the 6 tubes had a slight leak so i replaced them all with the plugs. Easy job if you make the DIY "tool" (washers on a bolt) and they're cheap so may as well if you are going through the trouble.
unless you know they've been done before or aren't a "while you're in there" kind of guy. oh and for oil i just use 0W-40 Mobile 1 synthetic from Wal Mart, honestly works just fine on my little 2.5 and you can get it on sale for $20/5 qt.
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