What about adding oil to the pasta cooking water and rinsing cooked pasta?

You’ll often see these instructions in pasta recipes. Don’t add oil to pasta water! It doesn’t do anything other than float on top and then, when you drain the cooked pasta, coat it so your sauce tends to slip off. Rinsing also creates slippery pasta. When cooked pasta is just drained, its surface is a little starchy and sticky, so sauce clings better. This is the preferred approach for Italian pasta dishes. Interestingly, however, most Asian pastas are rinsed after cooking because the slippery texture is prized. Also, Asian pastas are often added later in the preparation of a dish or are used cold, so rinsing is a way to keep them from sticking and also stop them from cooking further.