So I've been looking to upgrade again, and a used M3 or C6 Z06 have been my two options. I've previously owned a E92 335i as well as a C5 Z06 so I'm familiar with both cars, and the new one, while a DD, will see the track maybe 5-6 times a year, and about 10K miles a year of driving.
I love both, but the Z06's valve guide issue has me concerned, specially since the problem hasn't been quantified, and tracked cars are likely to see it happen more often. GM's warranty has been good at covering folks that have blown their motor, but what has been billed as a 'fix' (aftermarket heads) will void manufacturer warranty.
The M3 on the other hand, doesn't appear to have a major issue as such which is good for peace of mind... Straight line speed isn't my priority, and granted anything can happen at the track, threading the needle with blowing up your motor is not something I want to be thinking about at every session. With that, I've found the following car - and wanted to get opinions on fair pricing for it:
2008 E92 M3 - $40350 (with $599 doc fee included, yay
- 31K miles
- Space Gray Metallic / Fox Red interior
Ad says warranty available, but I'm friends with a SA there, car warranty expired on August this year. Solid service history though. I'd probably look into an aftermarket extended warranty nonetheless.