If you like your M3,why not just keep it as the majority of the depreciation has already happened and with another car your milege accumulation will slow down.I had an E28 M5 that I drove for about 20000 kms and sold it to have it come back into my hands again 8 years later with 250000 kms.Drove it for a while and it was still as much fun to drive to drive as when it was new in 1988.
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