To answer a few questions you stated right off, no, I haven’t seen a 2.8l Cummins in a vehicle other than watching the videos from Dirt Everyday where they outfitted a Jeep with one, so yes, I am regurgitating info from dieseltoys website, but most I bet is true.
It is a Chinese made Cummins, not an American made engine so right there is a turn off, and you can see an element of chinsyness such as a plastic oil pan (they even broke one in one of the episodes of Dirt Everyday) and I’d be pretty dissuaded by the fact there is likely little to no aftermarket for it so how are you going to get parts?
Go on eBay and there is a lot of genuine Toyota parts for those diesels so I’m still thinking an oem engine in a truck that has the near exact variant overseas mated to a D4D vs a 5V ZFE is a no brainer.
I was initially excited about the Cummins considering my Tacoma has over 300k miles on it and is my daily driver, but then the price tag went to $9000 before adapters or driveline mods or motor mounts and I said no to that, I’ll go with a rebuilt 3.4l with a supercharger for $3000 less.
I do agree with you in one aspect, the only way you’re getting a Hilux here is to import one 25 years old, but dieseltoys did say they have an option for a swap that has been executed several times and they said owners have been getting them licensed, so besides the outrageous price tag I don’t think you can rationally eliminate that as a possibility.
I think you owe it to yourself to check out that engine in person rather than rely on internet claims and short video's to form snap judgments.
FWIW, the guys over at Motortrend and Ultimate Adventure have had mostly good things to say about the 2.8l, as evidenced by how many builds are now featuring that engine. Plastic oil pan is one of the few negatives they've noted and one that can likely be remedied via the aftermarket (also it's generally a good practice to avoid hitting rocks with your oil pan, regardless of the material).
The engine is made in China, but it was designed by American engineers and is used in several different global markets. Also, quite a few automotive components and engines from big OEM's are made in places like Mexico and China, so I'll never understand why people make a big deal of that.
Parts availability shouldn't be a problem since you have Cummins vendors throughout North America. You'll certainly have an easier time finding parts for that 2.8l Cummins than you will for a Toyota diesel (at least in North America).
But even so, Toyota has done a whole lot of work making a 1KZ-TE be highly efficiency and it meets EURO IV and Aussie emissions rules that applied and similar and maybe tighter than the EPA Tier 0 Cummins has done with the 2.8 crate engines. Someone swapping a D-4D into a 4Runner just lacks a slip of paper giving Uncle Sam's approval since Toyota never sold it here. But it will meet just about every other aspect and intent to follow the rules in practice since they'll pass a tailpipe sniffer and smoke checker just fine.
I also think it's ironic that the guy who wants a professional swapped (those Dieseltoys swaps appear like they were stock) 1KZ-TE is the Federal criminal while the coal rolling jerk sticking some eBay piggyback ECU on gets a $100 citation from a local traffic cop.
On principle, I agree with you. The newer Toyota diesel engines, though they don't meet EPA regulations are much better for the environment than old thirsty gasoline v8's and/or some old pre-emissions diesel tuned for high horsepower. I would certainly prefer to see those engines made available.
But from a perspective of cost, logistics and EPA compliance, the 2.8l Cummins is a more
viable engine swap option than a 1KZ-TE (or comparable overseas diesel) swap.