Greetings, Although I've owned a BMW since forever ... (and still '72 2002tii), I consider myself a neophyte in all things mechanical etc. My last purchase was an M5 (E39) which I owned for 6 years, and it's there, I learned what it "really costs" to own an M. I'm looking for a fellow member to give me an idea what I might expect to pay down the road to maintain the low mileage (less than 50K) manual transmission M3. And please tell me it's less than the E39. With the kids grown and gone, the E46 is better suited size-wise for the missus and me. As an example would 10% of the purchase price annually be accurate? More? Maybe less? My driving habits are right forward. Although I'm not a track guy, I would drive the vehicle as it was intended to be driven. It won't see salt or muck, but I reside in the midwest and the weather often sucks. Secondarily, what should I look for, be aware of? For example, are the catalytic converters as prone to fail as they were on the E39? Thank you in advance.