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Originally Posted by BobH
As far as oil weight is guess I'll go with the Porsche owners manual specs.
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The only problem with the manual is that oils are periodically reformulated. At one point (IIRC) Porsche recommended 15W-40, and I think my car came with it.
There is a wealth of info on this subject. Search button here/RennTech or Google. LN Engineering has some good info, API site informative too.
Recommend an API rated SH or SJ oil. SL is absolute minimum.
Look for ACEA (European) A3/B3 rating also.
I no longer use 0w-40, and recommend 5W-40 or maybe 10W for mild winter climate. And maybe 50 weight for really hot summers.
There is a TSB on Porsche approved oils, many of us disregard it. I did after warranty period. But it is a point of departure for making a decision.