You don't HAVE to do anything. Those are the recommended torque specs. A little less, and you might have a leak. A little more, and you might strip the plug or break the plastic threads on the oil filter cap. If you're allergic to your torque wrench, try erring on the side of under-torquing and then give it little extra if you see a leak.Do I really need to torc the Oil cap and bolt on my Sorento? I've never done it on any other car I've owned... and never had a problem.