Ceos, Best of Luck with your new wheels, I have owned my older one for many years and love it, even more than my newer one. What I like best is the size and the ride. The interior is also more Cadillac than the newer one, I believe this is possibly why the STS is no longer a
sales leader for Cadillac.
Some Advise: Use the best gas you can buy, it will give you the best mileage and create less engine carbon build up. Run it hard, when on the highway open it up, this keeps everything working. And finally, keep the cooling system maintained, this is the only way to avoid one of the Northstar's biggest problems the headgaskets.
Re: 02 Seville STS 
Surf the threads here and find the "RPO" (production option) codes section, then look at the sticker under the spare tire cover and write down what your car has. Spend some time figuring it all out....... If your car is a "late" '02 you'll see F55 (suspension) as opposed to F45 for the earlier series. Look at the sticker on the driver's door and find the tire size and speed rating. Try to run Chevron, Texaco, or Shell gas......87 is fine (recommended by GM) and don't be afraid to turn off Traction Control once in a while and redline the car through 1st and 2nd. Learn how to DRIVE the car, not just sit in it. (BTW...the cutesy s/s caps on the lug nuts are flimsy......use a 3/4" or 19mm socket to ease them off before trying to attack the lug nuts with a 19mm socket. 100 ft/lb of torque on all lug nuts. OR go to ezaccessories.com and get a set of long 12x1.5x3/4 acorn hardened nuts. You're gonna have fun, but you haven't got your feet wet, yet)
