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Old 12-12-2011, 11:57 AM   #4
Scooby Specialist
Member#: 226864
Join Date: Oct 2009
Location: Southern NJ

I know only replacing tires in sets of 2 is bad for AWD cars because the small difference in the circumference of the tire (Even though it is small) is harmful to the differentials. I would imagine a doughnut is much worse. I would use it to get the car to where it needs to be, and keep from driving it.

Take it with a grain of salt because I dont know much about these drivetrains.
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