Noob looking at getting a 500E
Other than that a low mileage 500e will need basic matinance liek all other cars but will last a long long time.
The engine will require timing chain replacement at some point. Its not the chain but the plastic guides which fail. The wiring harness is the other big one.
Rust can occur but its not common. Check behind the front fenders as debri can accumulate there but be doubly sure to check the jack points.



