1HD-FTE Engine Service Schedule: How to Max Out 1HD-FTE Engine Maintenance Schedule The Toyota 1HD-FTE engine is a workhorse by any definition—a hard 4.2-liter turbo diesel inline-six engine famous for reliability, torque, and ruggedness. Bred to endure extreme conditions and used in the Toyota Land Cruiser 100 Series and other heavy-duty Toyotas, the engine is