The Circle L is an automobile engine produced by GM Powertrain Poland in Poland. It is a 1.7 L; 102.9 cu in (1,686 cc) inline-four 16-valve turbocharged diesel engine originally designed by Isuzu but now owned by General Motors. The engine is produced in Europe by General Motors for use in the Opel, Vauxhall and Chevrolet vehicles and by Honda for use in the Civic compact car.