Unfortunately, despite all intentions, you are not able to fully predict when and if the problem with the valve seals will affect your car. The only thing you can be sure of is the fact that in case of their failure, repair costs will be substantial.
Leaky valve seals symptoms
The obvious and first symptom will be blue smoke coming from the exhaust. You can read about this part of the problem in more detail in another article. It should be remembered, however, that if the engine begins to burn oil, it may come to a situation that before you refill it, it will already run out, and the engine will simply seize up.
Moreover, even if you manage to top it up before it runs out, some irreparable damage may have already occurred, which will cost you a lot to repair. This can be, for example, stuck spark plugs, damage to the catalytic converter, oily lambda sensor.
But what is the cause of such serious damage? Well, the biggest problem with damaged valve seals is carbon deposit. This is a hard white-green-yellow deposit that appears on the walls of the combustion chamber and the bottom of the piston in internal combustion engines. It is formed from unburned fuel and oil particles. It is very dangerous and in some situations can even lead to self-ignition.
As you can see, the problem is not small at all. You should take care of replacing the valve seals and their condition often enough.