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5-10 yrs, probably significantly lower as mentioned above. Over time, may be a different story for lower mileage ones as was last of bespoke N/A engines and production runs particularly on the E90 were really low (approx ~9k for the total run). Can point to last of air-cooled porsche's or 86-87 buick grand nationals/GNXs as far as "end of an era" and production numbers comps; those cars essentially held their value in nominal (but not inflation adjusted) dollars.
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