Do you change all four of your tires?

RustyRatRod said
It's not about a date stamp. It's about the physical diameter, which is a very legitimate point. It's the buyer's job to learn about what they are buying.

So...do they need to be perfectly matched like a pair of drag slicks?

junkyardhero said
a $350 oil change is not other worldly expensive in the grand scheme of things. especially with high end euro cars.

let's say he's got an A8 with a 4.0

that's 9L of full synth at $12 a quart plus a $25 filter so you're at like $150. throw in an air filter, a few o-rings, crush washers, some air box wax, disposal, tax, envro fee and presto there's $200 easy money. labor's easily that balance at $150/hr to bring it out to $350

That's not even that far off for an SRT car. A filter and 7 quarts 0W-40 synthetic alone is $100+ without the dealer markup.

66fyssh said
How do they account for tolerances in manufacturing? Can't tell me every tire is manufacturered to the EXACT same diameter. But I guess there is a sensor for rhat!!

Of course, every wheel has a speed sensor.