There are three key reasons why the transition to synthetic oils is occurring. They are the proliferation of smaller displacement turbocharged engines, escalating CAFE fuel economy requirements, and government regulations to lower tailpipe emissions.
Chevrolet Silverado's Turbo-Four Achieves 23 MPG on the Highway
Chevrolet's 2019 Silverado that's powered by a new turbocharged 2.7L four-cylinder engine can achieve 23 mpg on the highway and 20 mpg in city driving.