Just for fun I thought I would see if I could track down all the non-VAG diesels* for sale in the US in 2016 along with who actually makes the motor.

Make Model Engine Manufacturer
GM Colorado/Canyon 2.8 Duramax I4 VM Motori [Italy]
GM Silverado/Sierra HD 6.6 Duramax V8 GM/Isuzu [US/Japan]
FCA Ram/Grand cherokee 3.0 ecodiesel V6 VM Motori [Italy]
FCA Promaster 3.0 Ecodiesel I4 Iveco [Italy]
FCA RAM HD 6.7 Cummins I6 Cummins [US]
Ford Transit 3.2 powerstroke I5 Ford [UK]
Ford Super Duty 6.7 powerstroke V8 Ford/AVL [US/Austria]
Nissan Titan XD 5.0 Cummins V8 Cummins [US]
Mercedes E250/Sprinter/GLE 2.1 Blutech I4 Mercedes [Germany]
Mercedes GLS/sprinter 3.0 blutech V6 Mercedes [Germany]
BMW 328d/X3 xDrive28d 2.0 N20 I4 BMW [Germany]
BMW 335d/ X5 xDrive35d 3.0 N57 V6 BMW [Germany]
Jaguar XE 20d 2.0 Ingenium I4 JLR [UK]
Land Rover Range Rover td6 3.0 TD6 V6 JLR [UK]

There are (more or less) 14 Diesel engines in the light/medium duty market or thoseSo here is the breakdown

2 are US made

3 are Italian (VM Motori was owned by GM/Fiat now entirely FCA)

4 are German made

3 were designed in the UK

and 2 were joint projects between US domestic makes (GM and Ford) and foreign firms (AVL/Isuzu)

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For engine configuration:

5 I4

1 I5

2 I6

4 V6

3 V8

Quite a variety if you ask me.

Half of these engines are “Heavy Duty” only, which is a less stringent emissions category. This includes trucks with a GVWR of 8501 lbs or more like the Titan XD, Ford Super Duty, Ram/GM 2500/3500, and heavy cargo vans (passenger or cargo) like the Transit and sprinter. With the case of the vans, even though the engines are small, they are NOT certified for use in light trucks or passenger vehicles.

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Now I will say that many of these engines that started life as foreign engines (to US markets) have been substantially reworked for US emissions and NVH standards. In the case of the Canyorado, for example, there has been a lot of emissions, and NVH work done by GM in addition to the base motor.

It should also be noted that many of these are global engines with design happening one place, with support from another and manufactured in another entirely.

*excluded until all their VW/Audi/Porsche engines are clear and free