Toyota offered the 80 series Land Cruiser in multiple diesel variants, not originally available in the United States. The HDJ80/81 models sported a 4.2 liter turbo diesel engine, while the HZJ80/81 used a 4.2 liter naturally aspirated (non-turbo) engine. The 81 designation found in some models denotes that it was a vehicle intended for the Japanese domestic market (JDM).