Comment by jmb99

I have a decent amount of second hand experience with used cars, through my brother who is a mechanic and spent a number of years working at a used car dealership. Hyundai/Kia is the only company he ever had to do engine replacements for at said dealership, and he did dozens. All under 200k km (frequently right after the extended warranty on the engines ran out, and occasionally on the second or even third engine for the vehicle). These are cars with good service history and otherwise in excellent condition. Sometimes cars they got on trade, sometimes purchased from auctions, sometimes customer cars (after they were sold). No rhyme or reason, just a genuinely bad design that was “fixed” but never fixed.

The only other universally-bad major component is JATCO CVT transmissions. I think his record was an Infiniti QX60 that had 95k km and a blown transmission. Most small vehicle/sedan CVTs he did were in the 160-190k km range, with some lasting as long as 250k km. And of course they were not repairable, since even if parts were available, the entire thing grenades leaving basically nothing left to rebuild.

Point being, “one engine issue due to a manufacturing flaw” is drastically underselling the issue, at best. It is an incorrectly-engineered engine that fails prematurely when built within specification, except when the tolerance stackup lines up in your favour and you perform much more frequent maintenance than prescribed. Oh and the affected engines were manufactured over about 15 years (and there’s signs that their current GDI 4-cylinders are still affected).