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Have CL summer and winter wheels/tires and am fortunate to have a dealer that caters to their customers. I take my TTS in and they switch the wheel/tire combo from one season to the other. The wheels and tires that are removed are cleaned and stored for the next seasonal ritual all for about $60 a time. No other Porsche dealers in the Cincinnati/Dayton area offers this service and it makes the center Locks a non issue. Lets face it, if you get a non fixable flat on the side of the road with any Porsche tire, you need a tow anyway center lock or no. Village Porsche Cincinnati.
I got the same kind of service from my dealer, and took advantage of it until I realized they weren't insuring that the locking mechanisms were properly set before returning my car to me. That's pretty elementary stuff, and hence for that and a myriad of other annoying reasons, I no longer use "my" dealership.