In 3 years, I expect you'd see slowing depreciation once the market dries up from lease returns. The next 3 years will probably see the largest drop relatively over the next 10 years, since that's about the timeframe that most CPO cars are going out of warranty. Taking a look at the Z3M market for comparison (and it can be easily argued that the Z4M is a better looking, better performing car), I expect well kept examples to maintain their value in the high $20s in the next 5-10 years.
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