A co GM - Ford designed part, what could go wrong?

https://twincharlotte.com/top-10-common-problems-with-the-6t70-transmission/

https://en.wikipedia.org/wiki/GM%E2%80%93Ford_6-speed_automatic_transmission

Not exactly a list of reliable vehicles there.

Find the same chapter in an english version of the manual for the same car model? https://carmanualsclub.com/lexus-hs250h-owners-and-maintenance-manuals-pdf/

It’s all over the place. Depends. Find specifically what you want in terms of model and year then research it on Toyota forums.

A more unique car, other than body panels/glass/exterior might have 98% parts that came from, or were later used by other vehicles. But that 2% could bite you in the ass in cost or availability. You might need to get a shop to make parts for you.

Get an old fun/unique/car if you like learning, researching, and you don’t depend on 1 vehicle for your family/job/school. Also, if you have salty roads in winter plan on it costing you a lot more.

Aluminum gets brittle from heat Steel rusts Plastic gets brittle and snaps when you try to work on things. Vinyl cracks, though Toyotas is massively better than any other car I’ve known.

You might lookup production numbers. The more they made the more common, and cheaper, parts are likely to be.

until your car needs to pass a state emissions test