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Nick, I think part of the potential problem here is that Porsche has since updated thier oil recommendations, and that trumps the info in the Owner's Manual.
JCL12, how do you know the oil in the car is 5W30? Are you going by the actual receipt, which may be wrong? Or did they specifically tell you 5W30? I would bet they used the correct oil if they just did this last Fall. Give them a call, play "dumb" and ask the service advisor, "What viscosity oil do you use in the Porsche?" And see what they say.
If they in fact used 5W30...I would ask for a refund in some way or part. Worth a call to PCNA too. This may only work if they were a Porsche dealership.
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