The Sleuth wasnÕt expecting to catch ChevroletÕs next-generation compact tall wagon in the flesh so soon. And he was really caught off guard when discovering that the 2018 Equinox will have as an option a 1.6-liter four-cylinder turbo-diesel engine that’s rated at 136 horsepower and 236 pound-feet. That engine, as well as the turbocharged 1.5- and 2.0-liter I-4 gasoline engines, will be connected to six- or nine-speed automatic transmissions, depending on the powerplant. Al-wheel-drive will also be optional. Other than plenty of available torque, the turbo-diesel will be a fuel miser, with an expected highway rating of 40 mpg.