A Bmw 420 can reach a mileage of up to 142,000mi, before reaching the life expectancy upper limit. Fuel type is a major factor when looking into a vehicles lifespan/life expectancy.

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We calculated all of the below figures by getting average mileage from scrapped vehicles of this exact make, model, year and fuel type. We then get an accurate sum by taking into account deviations such as insurance write-offs.

Please note these life span averages are guidelines, and a vehicle may be unroadworthy before or after the estimated mileage.