30-40k miles on an M3, or any BMW for that matter, is absolutely nothing from a major mechanical standpoint. A major service should take place somewhere after 25k + miles, so you should make sure that that has happened and that the car has a full service history with a fairly reputable garage.
Obviously, you should have the car looked at by a pro mechanic before purchasing.
One caveat would be to find out if the previous owner tracked it or not. I'm not sure I'd want a car that had been run ragged around a track - whether the driver is skilled or not - it's going to shorten the life of some components.
I'm at 38k miles on my M3 and have no qualms about the mechanics or anything else. Performs like the day I drove it off the lot.
Last edited by alipali; 11-04-2013 at 09:42 PM..
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