I have a partial quart of the synthetic Super Tech 5w30 remaining from a March OC in my snow blower. It is in the clear container, and has a big ball of wax floating in it. Did not like that, and don't think I will be using it for the future. Now it has been stored in my shed since opened, however, if exposure to temperature or air caused this, it will certainly do this inside an engine as well. Dumped it out of all of my OPE and replaced it with AMSOIL Signature Series 0w30.