Mercedes-Benz engine replacement costs are among the highest in the automotive segment due to engineering complexity and proprietary parts. New engine for common platforms such as the M276 V6 or the M278 V8 can range from several thousand to over ten thousand dollars before installation. A used Mercedes-Benz engine with verified mileage typically costs significantly less, making it a financially practical option for vehicles outside their warranty period. The savings are most evident in models between five and twelve years old, where the vehicle retains usable value but does not justify new engine expenditure. Proper sourcing and inspection remain essential.