Do semi trucks have commercial grade turbo diesel engines? Can they last hundreds of thousands of miles? How? They are built for it. Sheldon Brown, Chief Engineer for Toyota says this engine was designed as a truck engine from the ground up. The turbo is built as a commercial grade turbo designed for 50% more duty cycles. Almost 3 inch cooling hoses. This engine was tested to the same rigor as the 3.5 and 4 liter V=6 engines on the Tacoma and 4Runner. All I know is it is faster and smoother than my 2023 Off Road.