How many of you put oil in the water when you cook pasta because you don't want the pasta to stick together? Have you ever noticed that the oil sits on top of the water? If the oil sits on the surface of the water then how is it going to prevent the pasta that is underneath the surface of the water from sticking?
In other words, you don't need oil in your pasta cooking water. All you need is salt to season the pasta. When you drain the pasta, if you are not going to use it right away, then you toss it with oil.