Porsche's updated recommendations are almost exclusively 5w40. The ONLY 0w40 recommended wt oil is Mobil 1, but among the Mobil 1 recommendations are nine others all with 5w40 wt. Apparently, if I'm reading this correctly (page 2, temperature ranges), you can use 0w40 for all temp ranges, but if the temp falls below -12 F you can ONLY use 0w40. Its a little confusing and took two readings to get that but I believe that's what its saying. Except for the one line listing of Mobil 1 0w40, the entire three pages of recommended oils are 5w40.
Go here:
http://mike.focke.googlepages.com/mikesporscheboxsterwebpages scroll down to the approved oils list. Its a pdf of the Jan,05 Tech bulletin titled "engine oils approved by Porsche".
This whole subject of oil viscosity, change intervals and everything else related to it is confusing as hell. Especially when Porsche changes their recommendations so frequently. The owner's manual says use 0w40. But I believe there's another tech bulletin disputing that. The change interval in the book is 15K. I believe there's still another tech bulletin on THAT subject also. I think I'll stick with either 0w40 or 5w40 and change it every 7500 miles and forget about it!
Bob
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