Toyota 1UZ-FEAt the 1989 Detroit Auto Show, Toyota unveiled one of its most ambitious projects ever: a luxury sedan to rival the Mercedes-Benz S-Class called the Lexus LS400. At the heart of this all-new car sat a V8 engine that had been put through more than 1.6 million miles of on-the-road testing before even making it to production. Referred to as the 1UZ-FE, its design drew from racing engines and was considerably tougher than it needed to be in order to provide the ultimate reliability.Its power output wasn't revolutionary, with 256 horsepower and 260 lb-ft of torque available at launch. However, the smoothness with which it deployed those horses was unlike any Toyota product before it. That wasn't much of a surprise, as it was the result of a project that had taken six years, a huge team of engineers, and a billion dollars in development cash.The LS400 took the luxury car market by storm, offering the technology and refinement associated with the top German flagships while undercutting them on price. It helped transform Lexus from an overlooked outsider to a key player in the industry, and in the process, racked up some unbelievably high mileage. The highest mileage examples of the 1UZ-equipped LS400 have crossed the million-mile mark, and even less well-cared-for examples can rack up several hundred thousand miles without complaint.