The Toyota AD engine family is a series of 16 valve DOHC inline-4 turbo diesel diesel engines with electronic common rail direct injection using an aluminium cylinder head and an aluminium cylinder block with cast iron liners derived from the petrol Toyota AZ engine.

[2] These engines are produced mainly for Europe, but few are exported to other areas such as India or New Zealand.

Technical specifications:[3] Applications: Intercooled VGT Applications: 126 PS (93 kW; 124 hp) at 3600 rpm, 30.6 kg⋅m (300 N⋅m; 221 lb⋅ft) at 2000-3200 rpm (Europe, DIN) The AD series engines would get refreshed to meet Euro V emissions with an upgraded fuel injection system, lower compression and addition of a DPF system collectively called by Toyota as Toyota Optimal Drive .

Technical specifications:[1] Applications: Intercooled VGT 136 PS (100 kW; 134 hp) at 3600 rpm, 31.6 kg⋅m (310 N⋅m; 229 lb⋅ft) at 2000-3200 rpm (Europe, DIN) The AD series engines would get refreshed to meet Euro V emissions with an upgraded fuel injection system, lower compression and addition of a DPF system collectively called by Toyota as Toyota Optimal Drive .

Technical specifications:[1] Applications: Intercooled e-VGT 177 PS (130 kW; 175 hp) at 4000 rpm, 40.8 kg⋅m (400 N⋅m; 295 lb⋅ft) at 2000-2600 rpm (Europe, DIN) The AD series engines would get refreshed to meet Euro V emissions with an upgraded fuel injection system, lower compression and addition of a DPF system collectively called by Toyota as Toyota Optimal Drive .