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The E46s (1999-2005) are pretty bullet-proof. As far as major failures, figure on very seldom to never. The 2.5 and 3.0 are of the smoothest most reliable straight sixes in the world. Just my opinion, but I've owned half a dozen of them with -0- problems. Cooling issues will be your worst problem. They do tend to eat water pumps and blow expansion tanks...very common on a higher mileage one. Some of the earlier E46s had problems with the VANOS system too... but still not a major issue. As far as a M3?? Well, I've never had one of those, but they are a completely different animal. Considerable more expense in maint. I would guess. Most importantly, if you are young (I am not), check your insurance on a M3 before buying!! You can go to E46fanatics or bimmerforums and get lots of questions answered. Just like here, you only hear from the people with problems. For not much $$ you can mod out a 325ci or 330ci to look just like a M. They have entire sections on it if you're so inclined. If you're going to use it as your "only" or "daily driver" I'd go with the 3 car just for practicality.
sean
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