Ya, it looks like it doesn't thoroughly mix with oil. The dipstick shows it's mixed. I used a measuring cup to add another half bottle for a 6 quart oil capacity. I bought 3 bottles for (2) six quart applications, I was going to just add the extra 2oz, but half the bottle is 5oz, and I didn't want to keep the leftover that long. I put oil in the measuring cup and swirled it around, but the straight Ceratec stuck to the cup. I used a spoon to stir it, but still didn't get it all. Seems it would be better to pre-mix (shake) it in a half full quart oil bottle, then rinse it out several times with oil. I put a quart or so of oil in the engine before pouring the first can it, so hopefully it will mix well.
When cleaning the measuring cup with Oil Eater, it "ate" the oil, but the Ceratec seemed to stay insolvent.