The BMW N63 engine was launched in a mid-sized luxury what?
BMW X6 The BMW X6 is a mid-size luxury crossover by German automaker BMW.
Mercedes-Benz W186 The Mercedes-Benz W186 model 300 was a four-door luxury tourer produced by Mercedes-Benz between 1951 and 1957. The company's largest and most prestigious automobile, it was the Maybach of its day, elegant, powerful, exclusive, and expensive. Three versions were produced in succession, known informally as the 300a (or simply 300), 300b, and 300c. An enlarged "300d" variant built on the W189 chassis succeeded it in late 1957.