#shaved

John writes:

Hey Sajeev,

Since you requested goofy questions for Piston Slap, I’ve got one:

A friend of mine told me that her dad had a Subaru (I don’t know what particular model). He had one of the tires blow out, and even though he knew he should either replace all four tires, or have the new one shaved down to match the other three, he decided to risk it and just use the one new tire as is. Consequently, the all wheel drive system got messed up due to the ever so slight mismatch in tire diameters. Is this for real? I’ve never heard anything like that before.