Not intending to
but there's a used '06 M5 at the local dealer, a fresh trade-in for a new M6. When I asked if it was going in for a CPO inspection, the sales manager said that BMWNA will not CPO the E60 and E63 M models; they are to be sold as is, with only factory warranty coverage. Puzzling. But there is not a single CPO E60 M5 nationwide on the BMW CPO search website although that may be more indicative of scarcity than policy.