JDM Gen 3 Engine HG and Oil Consumption issue rates?

So, I have a 2010 Prius with 217k miles that I've owned for a little over 2 years, showing signs of rapid coolant loss and daily heavy engine knocking and shaking during morning startups and now afternoon startups as well.
I've parked it in my storage unit and am now daily driving my ISF while I search for an engine to swap.

During my lurker status over these last 2 years preparing for things like this, I haven't seen much mention of JDM Gen3's exhibiting the same HG and Oil Consumption issues as we have (much like the 2008 Honda CBR1000/Fireblade Oil issues in US vs JDM bikes). Could this mainly be due to the extreme lower mileage these cars get up to from Japan (most of their cars hitting no more than 40-50k due to the Shaken)?

I ask because I am weighing going for a JDM engine from a Gen3 with low miles so I can more easily do a swap, vs an Engine from a Gen4 which will require me to spend the extra time and stress making the adjustments and mods needed to fit in my Gen3 body.

 

I believe the JDM engine vs USDM engine Oil Consumption issue on these cars deserves more looking into. I think it's going to be hard to gain enough examples as cars in JPN just aren't driven as long and as hard as in other countries- I mean, how many examples of cars do you see over there hitting 100k+ above? I based my theories on the examples we had years ago with the 2008 Honda S1000RR/Fireblade as described above. From what I remember then, Honda couldn't quite explain why this was an issue with the US versions with engines having problems as early as 3k miles vs JDM's hardly experiencing this well past that mark....blah blah...

Honestly Anyways this won't matter as we are now blessed with many options on what to do!

To answer your last question, after reading many threads with successful swap options, I ended up purchasing a US Gen4 engine out of a crashed 2018 vehicle with 27k off of ebay (seller benzeenautoparts) for around $1200 shipped. It took me 2 months to install during what little spare time I had during the work and on some weekends. Again, many thanks to @Ragingfit with his FixThatPrius youtube videos, as well as many other forum members and their clarifications! I kept my Intake and Exhaust manifolds as well as EGR cooler (which I think is the BEST, quickest and easiest way to make this work). I've been driving the car around for a week, monitoring coolant levels and checking for leaks and she's been smooth so far!

I spent little money on this swap-

$1200 engine w/ shipping
$180 new OEM Gen4 Waterpump
$150 Harbor Freight Engine Lift
$35 new OEM Thermostat
$42 OEM 10 pack of Oil Filters
$40 Coolant from O' Reillys
$3 Hose clamps from O' Reillys

benzeenautoparts shipped me an engine with the waterpump, intake and exhaust manifolds removed
I plan to sell off the Engine Wiring Harness, thermostat, EGR Cooler, EGR Sensor and little pipes on eBay to get some money back. Not sure what to do with the engine right now...maybe that can be sold for cheap locally, as it may be a headgasket repair project for someone to play around with? I do not know, we'll see.

 

Update: I threw in the towel.

So I've been planning to taking a beat to update everyone what happened after this video, but just thinking about it just gives me a headache. So long story short for now, I swapped out the Gen4 Water Pump with another NEW OEM one. After doing my best to bleed it, the new one made the same exact noise and I was still having creeping Overheating issues.
I spent like over 4 hours with the car outside, doing another bleed- jacking the car up and down and letting the coolant overflow out from the reservoir in its position and elevated from a bungie..jacking it up and down, forcing coolant into the purge valve..I tried it all to no success.

I threw in the towel and txt'd a buddy who used to be a Toyota Master Tech and told him everything I've done in the last few months with this car- which I was hoping to get the swap running and impress him with what I've done, but this became a consult instead. He then told me his experiences in the past in dealing with these Gen3's years ago while he then worked for Toyota, and the lengths the techs had to go through just to bleed the coolant systems in these cars. I asked him to go over everything involved in the swap that I performed, like checking the engine, the water pump, thermostat, egr, cooling lines etc. and assured him I would pay his rate for this inspection as I wanted to learn what from this experience on what went wrong.

So he had the car for around 2 weeks, checking over the engine, and everything else related to my swap. He did note that the water pump was working as it should (as seen through techstream) and that the noise we heard on the video may very well have been due to the air in the system causing that weird howling noise. He also couldn't find anything much happening with the 2018 engine itself, but was wondering about the crank and its communication with the 2010 ECU and would ask some of his other former colleagues how different- if any, are they from the 2010 engine...

After another week of testing and driving it, he just couldn't immediately see why there was still air in the system. He did advise he didn't find much wrong with the swap like the coolant lines, or wiring. It was at this point I gave up and offered to sell the car to him. I was just done with this turd. I lost all confidence with this thing to ever run 'normal' and not slowly creep up and overheat and leave me stranded somewhere.

He said he would continue playing around with it to see if he could find out what was causing this and let me know so I could learn from this, but I am just so over this.

I'm now back to DD'ing the F now. Just gotta remember to keep the speeds down!

I kinda did have some fun and took on the challenge of doing a job like this and learning some new skills along the way.

 

RagingFit's Prius seems to be running OK based on one of his recent video updates; I haven't caught up on the other Swap updates on this forum, and I wonder if any of the others have fully resolved these Overheating issues?

I'll be around, most likely back to my lurker status from the years before I created an account right when I purchased the Gen3.
My mom's Gen2 is still running incredibly well, so I'll no doubt rely on this forum- but not as much because that 2008 hasn't many issues in the last 8 years she's had it!

I don't think I will buy any Gen3 ever again. My friends and family saw the numerous times I've worked on that thing, and I think it's the most unreliable car I've ever owned, or even driven!

Thanks again to RagingFit and NutzAboutBoltz and every one you you major players on this forum! Your information is golden, and I am sure you all will become even more popular as these cars are now hitting milestones that will drive more people to come here and learn how to tackle these issues.

I gotta say I won't miss EGR cleanings one bit! LOL

I will reach out to my buddy soon to see if he's given up and parted this out for his other Prius' and customers, and I'll bring up the 'jiggle pin' angle for him to try.

 

Oh and I put up like 9 parts for sale on EBay over the weekend, and would you believe my Gen3 EGR sold out in under 12 hours?!
Incredible! LOL