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Seriously how do I even go about going after Costco for the performance loss, loss of time taking the car to the dealers having to drive the loaner.
I still use Costco gas in my 911 and the Cayenne, both cars runs fine. Heck once in awhile I would use Costco in the Ferrari.
Maybe it has to do with the direct injection?
I've used fuel injector cleaners when I was having injector issue but not recently. Sort scared about upsetting the system.
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