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Changing your own oil won't screw up your warranty, promise. Magnuson-Moss federal warranty law ensures it. Smart money is don't buy anything from the dealer unless it's covered under no cost warranty. Dealers always have crazy high prices, and you can alway bring your own oil if you get it done elsewhere (that's cheaper too).

Also, tire cost is the same whether Vette or Porsche -- probably even cheaper for the Porsche if you compare apples to apples since the Vette's will be wider. My 19" Michelin Super Sports (top of the line for street) were only $1200 with road hazard from tire rack. You'd run the same or equivalent on a modern Corvette.