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MY01 BoxsterS manual says 20k km or every 2 years, including filter. Factory / dealer fill is Mobil I 0w40.
I had a short moment of trouble at a track once with my lifters and was advised by the dealer to use Mobil 5w50 then. They said its also approved and they use it for the 996 turbo's and GT3's.
Lately I don't track that often anymore and I drive about 5-7k km with the S each year.
All together I stick to changing the oil with Mobil I 5w50 each year and changing the filter each other oilchange (so every 2 year). Works perfectly for me and I like working on my car (*) so the additional costs are easily bearable.
(*) I hate changing oilfilters though. It always gets messy...
Mark.
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