Overclocking issues and resetting to stock often

I had to overclock my CPU to boost its performance. I have a Core i3-530 and after overclocking, I could do 3.6ghz at stock volt. I have since overclocked it to 4.07ghz. Is it safe to stay overclocked at a point like 3.6ghz then reset back to default frequently or do a certain speed and leave it there. I am definitely concerned about power consumption and the longevity of my CPU. Help please.
