Replace or Add On
Since adding cars in gta v leads to crash.
Thus, Replacing Cars also lead to crash or only add on cars lead to crash
We need a lot more detail if you're going to get any help. What gameconfig are you running, do you have the required mods installed, have you got the packlimit adjuster, heapfile etc, what vehicles are you trying to add? Its impossible for anyone to tell you if a replace car will also crash your game