Ok since there has been a lot of discussion and speculation on why the Grenadier uses BMW powertrains, I did some Mi6 spy stuff (or used my 98% common sense engineering brain) and recovered actual (or probably close to it) discussions between Ineos and major engine manufacturers from around the world.
yadda yadda
Sir Jim: "Thanks. I guess."
Pretty much all of the companies mentioned, with the possible exception of Toyota (volume issues with TPS from what I understand), will partner with another company to unload off the shelf drive-trains. It's easy money in a low margin business. Land cruisers, G wagons, Bronco's or pickups aren't going to lose sales to this thing, and if they can take a chunk of the profit without development costs, they would be all in.
I believe the gasser transmission we are getting has a TQ limit of 350ish ft/lbs, which is close cutting it for truck that will supposedly be used as beast of burden, not a mall cruiser. It's the sedan version with a heavier tq coverter. Wanna add some power? Not with that one if you intend to tow.
As to what would make me feel better? like I said, something from a light truck manufacturer. An LS with a 10L for example, would give you all the power, reliability, durability, and and cost effectiveness you would need. Yea, I know, its not a "world architecture".... because we all know some shade tree shop in the Indonesian jungle is going to be BMW certified and can track down issues with the goofy intake and whatnot.
Considering the hoopla for the BMW partnership, I actually think what they liked most was the image of the German engine, as real costs per unit likely aren't that much different for an OEM supplier for something from a company like GM. So, they went with what WOWed in the brochure and they could charge a premium for and had a bolt in diesel option. As for burning oil, with the finicky natue of modern "clean" diesels (I have one) and the now common of 8,9, and 10 speed autoboxes, the lighter duty diesels lose much of their advantage and will be going the way of the dodobird anyway. Gasoline is everywhere.
It sems to me, as this thing has evolved, the reality of low volume production needing premium pricing to survive has set in, and the original concept of resuscitating the Defender workhorse tractor has fallen to the same forces that created the new Defender we have today... sex appeal for money.
Will the rig work? I'm sure it will. Lots of things with 4 spinning wheels get around. I've seen Mercedes sedans pretty deep in the amazon too, but I don't think that was what was being sold to us with the stoty of the defender reboot penciled on a bar napkin.