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I used Mobil 1 in almost everything I own, but for the Boxster I've gone with RedLine 5W40. No more clacking noise on start up and the lifters are much quieter.
I've driven the car to and from Watkins Glen and NJMP in over 100 degree heat and the temp gauge stayed at 185 the whole time.
My only complaint is you can't find it everywhere.
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