Not much - what is all this vibration talk? I had new Michelin tires - awesome, quiet and great.
LOVE IT!!
Forget high priced imports. I paid cash, have no payment and a great car!
I have an '02 STS. I bought it with 47000 miles on it. It was flawless for the next 13000 (I too have some vibration at about 70 mph though, but livable). At around 60,000 miles I came back when it was parked in the airport ramp and the lights worked well, everything seemed great, but it would not start. It wouldn't even 'click'. It was like it was in gear and wouldn't start. I brought it to the Caddy dealer and they replaced the battery (even though the lights, etc. worked well. Anyway, no problems for about two weeks and then it was parked in my garage for about 8 hours overnight and when I went to start it the same thing happened. Nothing. Then the next day it started fine. What the heck??? I am afraid to take it anywhere and turn off the engine because I may be stuck and require another tow. Anyone familiar with this weird problem??
I've read it has something to do with the dash light dimmer to interior light switch. Leaving it inbetween those positions can cause the problem.
The vibration is because of tires and intermediate column shaft.