BMW’s M series of engines doesn’t necessarily refer to the manufacturer’s performance-oriented line of Motorsport models. M designates a line of engines that BMW offered in its cars from the mid-1970s until 2005, the first of which were units like the M88, M20, and M30, and it marks the closing of an important chapter for the manufacturer since they were among the last naturally-aspirated BMW engines. Next came the line of N-branded engines that introduced turbocharging and downsizing. This
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