We all know what it's like to feel under pressure. But imagine the pressure you'd feel if you were a BMW engineer and your boss told you: "Okay, next job on your list: improve the 3 Series." Yikes. Not only is it a massive seller for the Munich marque - the 3 Series accounts for 25% of all BMWs sold - but it's also the benchmark compact executive saloon and has been for the past 40 years.
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