Just purchased a 2011 CPO AWD S60 T6 and to my surprise when I got it home I realized that it didn't have a Spare Tire, which I should have checked at the dealership. When I called the dealership he told me that the car doesn't come with a spare tire. I thought he was BS..ing me, but after doing some research, he was in fact telling me the truth. It comes with a Tire Sealant and with my luck, I will probably get a flat tire at 2:00 in the morning during a rain storm.

My car is equipped with tires that measure 235/40 R18

I've seen donut tires with rims on several sites that measure 125/80 R17. Can I use this tire as a spare as I can't seem to find a donut that is R18?

Thank you.