Fresh pasta should have some flour left on it, and a few tablespoons of oil in the water. I use regular vegetable oil, you don't need olive oil for this. For boxed, make sure you stir after the first minute, and stir again after another minute. Once rapidly boiling you should be OK. If you dump the noodles, and set the timer, and leave unattended you will get sticky noodles. I like to add my spaghetti a little at a time and not all at once. Once it has been drained, you should put the sauce on immediately. Toss pasta with sauce and add more sauce as needed. If you are leaving the noodles, put a little butter on them and toss around to keep from sticking. If you want cold noodles (for something like pasta salad), just turn on the cold water and stir with your hands until it is cold throughout. I find that there really isn't a big difference between cheap pasta and more expensive pasta when it comes to sticking. If you want to try making pasta, check out my hub.