Differences Between the 2021 Cadillac XT5 and 2021 Cadillac XT6 Photo: Cadillac The 2021 Cadillac XT5 and 2021 Cadillac XT6 are both luxury SUVs with similar amenities, but the two models have their share of differences. Here’s a look at how these two Cadillacs measure up against one another. Photo: Cadillac Both the XT5 and XT6 boast the same powertrain. They come standard with the 2.0-liter Turbo four-cylinder mill that produces 235 horsepower on the XT5 and 237 horsepower on the XT6. It delivers 258 lb-ft of torque on both models. These luxury SUVs also offer the available 3.6-liter V6, which pumps out 310 horsepower and 271 lb-ft of torque.