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If we buy a CPO car, would we have to do all the services (oil/fluid changes) at the Porsche dealership (which is more expensive), or can we go to an independent workshop for services and still keep the CPO for major repairs?
You should be fine with independent workshop. Porsche dealerships are priced to rob you and all consumer so they can have some nice snack and fancy espresso machines in the dealership.
Just keep the receipt for reference if any warranty work try to blame it on you.