G8R45 wrote:I had a 325i. Don't get me wrong , it drove very well. It went thru rotors every 10,000 miles or so. They covered them under warranty the first time but then i had to spring for new ones. ..... I never did understand the rotor warping problem. I have owned 6 MB's 3 Audi's, 2 pevious Infiniti's and 2 Camaro SS's and drove them all the same way. The only other rotors I ever had to replace were on the second SS and that was a performance upgrade to a BAER system. I just think the BMW's were built to thin and would warp very easily.
Hmmm... Q45 rotors are famous for warping pretty fast compared to other cars. In fact new Q45 had warped rotors mentioned on several long term reviews in car mags, all replaced under warranty (which is not normal for most cars, but I guess Q45s are special

).
On the '90-'96 Q45s it's a good idea to have the rotors resurfaced in between pad changes, or about every 8-10K miles.
Just depends how picky you are.