Mako. In Europe the 'greenies' started pushing for cleaner diesels by making laws which forced the engineers to bring in advances in emission controls.
Each law was called a Tier, i.e Tier 1, Tier 2 etc.
The 'greenies' barely gave the engineers time to catch a breath before they introduced another tier until they reached tier 6.
After that it became impossible for the engineers to go further mechanically and so computerisation of fuel delivery systems, injectors, pumps etc was introduced as you will now see on any modern engine.
For a boat I would never accept any engine with computerised control.
They definitely work but indefinitely and I for one would not want to get caught out at sea in any weather with an engine having electronic problems.
As I stated above I have recovered a total now of 6 boats with engine fuel problems caused by electronic fuel systems.
An engine I would definitely fit if ever I were to re-engine would be the Mitsubishi S6T, extremely quiet and smooth, lightly turbo'd with lots of torque, best of all it has a timing chain not a belt and has 'wet' liners so any future rebuilds would be a piece of cake.
JD engines are not usually used here in Europe.
If you look at Europe today (February 2022) you will see the 'greens' have pushed Europe into total dependency on Russian gas and left themselves in a situation of blackmail.
I'm all for improving our climate, but our problem is overpopulation of African, middle and far Eastern countries.