However, some applications in non-PSA vehicles had the engine installed longitudinally, with rear-wheel drive.

[1] Displacement ranges between 1.8 and 2.1 L (1,769 and 2,138 cc), and all XU diesel engines have a stroke of either 88 or 92 mm (3.46 or 3.62 in).

[1] It was also particularly light, with a ready-to-run XUD9 weighing 157 kg (346 lb), 15% less than a comparable diesel of the previous generation.

A feature of the Ricardo Comet pre-chamber design is that it makes the engine tolerant of low Cetane value fuels such as SVO.

An intercooled turbocharged version was introduced later, with 90 PS (66 kW; 89 hp) on tap.

Both engines also featured either a Bosch or a Lucas mechanical fuel pump and injectors.

The BTE engines used a Lucas EPIC (Electronically Programmed Injection Control) fuel pump, whereas the ATE engines used a Bosch injection pump with a throttle cable.