Just turned 40,000 miles on my Y2K GS300 and needed tires. I replaced the Bridgestone Turanzas with Potenzas. I only have a few hundred miles in them but so far, I'm pleased. Bridgestone makes different grades of Potenzas, I got the '92's, which seem like the less aggressive tread, because they were the only ones Costco had in the proper size (Costco had a $60 discount on a purchase of four). I couldn't find much info on the boards on replacement tires. Anyone have experience with this or other brands? The Potenzas were about $105/tire with the $15/tire discount. With a year left on the lease, I didn't want to overbuy but I may keep the car and we're just getting ready to take a six state/Canada car vacation. Rudy