I counter you with a Cleon engine[0] with 42 years. ;)

But in the end an engine can be reliable but still be an environmental liability.

[0]: https://en.wikipedia.org/wiki/Renault_Cl%C3%A9on-Fonte_engin...

I’ll counter with the jaguar xk engine in production for 43 years.

https://en.wikipedia.org/wiki/Jaguar_XK_engine

I assume the American s will be by with a pushrod v8 soon.