actually even before warranty also many ppl sell their car. example u can see the g20 330i. common issue is the bearing rod. but that one can be solve using third party parts. got solution already. but by doing that, it will void the warranty. i dont mind with such small issues. its still bearable.

the smart warranty cover quite alot depends on which plan you take. even cover the turbo part. but need to pay yearly for 2k per year. if no warranty then just find a trusted workshop to repair any issues arise.