Later HDi engines are built as part of a joint-venture with Ford Motor Company.

The DJ engines were for installation in commercial vehicles, while the DKs were for passenger cars.

NOTE: The six-cylinder PRV engine (Peugeot, Renault, Volvo) was built in the same factory in Douvrin, France.

The DT is a family of diesel V6 engines shared between the PSA Group, Jaguar Land Rover and Ford Motor Company (where it is called AJD-V6).

The DV is a family of diesel inline-four engines shared between the PSA Group, Mazda Motor Corporation (where it is called MZ-CD or CiTD) and Ford Motor Company (where it is called DLD).

Volvo Penta made a series of engines based on the six-cylinder XDP (MD27-32).

The XK was an all-new family of inline-four petrol and diesel engines developed for Peugeot's new 204, their first front-wheel drive car.

In 1979 the XID appeared, with 1,548 cc this version shared many parts with the XR petrol engine.

Both the original XK and the larger XL underwent major changes around the end of 1975, receiving shorter strokes and wider bores which ended up resulting in nearly the same displacement and with very similar outputs, albeit with lower torque.