BMW's redesigned, third-generation X3 adds upscale cabin amenities, technology, and safety features. Most X3s are the 30i version, which uses a 248-hp, 2.0-liter turbo four-cylinder engine. It delivers quick acceleration and returned 24 mpg overall in our tests. The uplevel M40i gets a 355-hp, turbo six-cylinder. As before, its smooth eight-speed automatic transmission and all-wheel drive are standard. The new X3 is super quiet inside, with impeccable fit and finish. Handling is quite responsive, and the ride is firm yet absorbent. The latest generation of the iDrive infotainment system has been simplified. Blind-spot and lane-departure warnings, as well as low speed automatic emergency braking, are common options. A rear-wheel drive sDrive30i is added for the 2019 model year.