I bought a new E350 Luxury model last month and I just realized that the tires on the car are not the same as listed on the car sticker. The sticker shows that the car comes with 17 inch all season tires. The tires on my E350 are actually 18 inches staggered performance tires (front tires and back tires are different sizes). I went back to the dealer and told him about the issue. The dealer is saying that it is normal for the dealership to swap tires and it is up to the customer to validate it before buying. Is this normal? I don't really want performance tires. What is my recourse? I have 550 miles on the car so far