Question about Cooler Master Liquid ML240L RGB

The heat-conducting paste that comes with it is not the best. I would rather buy a fresh heat conduction paste, Barilla or something.

The thermal paste is supplied with the cooler. You have to smear it on before installing the cooler.

Is it enough for an overclocked I5-9600k?

is the supplied thermal paste sufficient for an 8600K? Or is it worth buying Thermalgrizzly kryonaut as well?

Can I overclock an I7 7700K with it?