Replace Pistons/Rings vs New Short Block vs Ignore?

I had a rebuilt engine put in with 2015 pistons and rings, all is good since then

Oil level is right here it needs to be.
Also coolant level has not moved.
So the Felpro gasket they said to use is holding up just fine.

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Brand new short block from Amayama in Japan $1798 + shipping:

Short block assembly for Toyota Prius XW30, 3 generation 01.2009 - 11.2011 - Toyota Car and Auto Spare Parts - Genuine Online Car Parts Catalogue - Amayama

 

How about just replace the rings, with original, “low tension” rings? I know, but it’s cheaper and easier, and buys you at least another 100k miles?

 

We swapped in a used JDM thing in the oil is staying right where it needs to be everything running just fine and that didn't hardly cost squat so I can't see spending two grand for a short block and all that kind of stuff I mean the car is not going to be with you like that at this point and now I have two coolers for the EGR and extra head etc etc that i'll probably never do anything with and that fell pro gasket is a great gasket mine has less than 12 miles on it before the engine blew probably never get used again even though it could be

 

Japan domestic market it's an engine that hasn't been touched by people in America yet so low mileage take out from an Asian market car that's all a few people have put them in and fooled with them here with a zz engine the open deck way the engines built there are some inherent weaknesses and apparently piston crowns like to peel off the top of the Pistons or something I don't really know and I'm not fully interested in knowing I just wanted it out of there with the high miles that it had so I just put an engine and the transmission in the vehicle with way lower mileage than I could expect to find in the states and if I found similar mileage in the states would have been $3,000 for the pair not 1125

 

It's possible you may have no further issues but generally it's more possible that you shall going forward mileage doesn't go down so it's just an inherent thing in some of these ZZ engines I have one in a Corolla that's had similar course of that 500,000 miles may have something to do with the type of engine stroke that we have it's not I can't remember the name of it but anyway who knows but it certainly won't get better it will get worse I would think

 

What year was the rebuilt engine? Were the pistons and rings older or newer or same age as engine?

 

So far running like a champ you can't even hear the damn thing when it's on inside the car out but no matter the one that we bought with it in there you definitely could and I didn't think there was anything really wrong with it when I bought it no lights on engine running like a Corolla 2z didn't think much of it and just another Prius

 

@PriusCamper

The donor was a VIN verified 2010 and they installed brand new 2015 pistons and rings

 

Well I hope costs were not too bad . I'd hate to pay for internal engine work today. Was less expensive to me to get an Asian market take out . Just like actuator and abs pumps 150 bux vs what thousands .....

 

Doing the pistons and rings is an engine out job so you need a hoist and probably some help. Toyota says to drop the subframe, transaxle and engine. Most diy come out the top but risk the windshield. It seems quite a few problems occur with the timing even though everybody thinks they did it right. I would have the head rebuilt by a qualified machine shop. There is always the question of replacing this and that while you are at it.

 

This TSB summarizes a block rebuild.

 

We came out the top windshield was not an issue Hood stayed on the car stand straight up engine has plenty of room to come out the windshield wiper tray obviously is out not a big deal I was standing right there during the whole mess I wouldn't even attempt with Toyota parts or not to rebuild the bottom end on the fly without a lot of machine shop work and funny business so look for a JDM engine and maybe it's transmission and don't look back it's probably the cheapest thing you'll get away with doing