Hi,
The Boxster uses Mobil1 as the recommended Oil. The recommended change interval is 15k mi., but you don't want to go that long. 7.5k-10k mi. or annually (if lower mileage) is a better recommendation, but at least annually. 0w-40 is the weight you want to use. The Oil change calls for 8.75 Qts.
The Tires sound about right for the Car and mileage. Proper inflation and alignment are key to getting the most from the Boxster's Tires, because it does like to eat them. Good Luck!...
Happy Motoring!... Jim'99
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