As for Mafia 3 to keep the car

Many players want to know how to save cars in Mafia 3 Unfortunately, the game doesn't give you that option, so all your cars will disappear if you leave them on the streets for long enough.

The only way to get same cars when you need them is to unlock one of Burke’s upgrades, which will basically allow you to spawn vehicles next to you. The ability to store cars could definitely be useful, yet the developers decided to not add it in the game.