Different oils have different consistencies and properties and I haven't tried sunflower so I couldn't comment. Usually when an oil goes rancid it's first sign is a bitter somewhat nauseating taste - but not necessarily.

What are you looking for oil pulling to do for you? If your oral health is good, you won't notice anything dramatic but bacteria will continue to be cleaned in your mouth which feeds directly to your cardiovascular system. So great for your health even if you're not feeling anything to profound at the moment.

You also might want to experiment with different oils. Definitely try coconut or flax seed oil. In addition to some interesting properties they're both an excellent way to absorb omega 3's.

I am new to OP. I have been using sunflower oil for about a week now. No blobs.

I have gum issues.....pockets and bleeding. The bleeding is not all the time, but just before I began OPing, it was fairly heavy in one spot of my mouth. After first day of OP it was diminished significantly. After 2nd day, it was gone. Well, if I did some heavy duty flossing or using of the rubber tip, it would start again, but just the brushing of the teeth no longer started the bleeding.

I go to the dentist in a couple weeks and I'm anxious to see what the report is after just a few weeks of this!