The requirements from all auto makers, not only for ECU, but every single part is 10 Years/ 100k km for low end, 15 Years 150k km for high end. I think that is no secret. And that is 100% the experience if you buy a car, there is a point where the maintenance per year is more than the value of the car itself. At that point the car is effectively 0 EUR value.
I hear in USA the Toyotas hold much longer... I'm not sure why, if it is true, and what are the conditions.
The maintenance must be seen as per the service value, not the car value. If it's in good condition then maintain it and drive until pistons goes through the head. Keep this gray energy off the scrapeyard.
I’ve take a mid 2000s Corolla and a 4Runner to 250k. The Corolla was still running with a slight radiator leak. The 4Runner had a transmission banging noise I didn’t want to fix.
No salt on my roads and little to no rust on either.
I hear in USA the Toyotas hold much longer... I'm not sure why, if it is true, and what are the conditions.