Can additives precipitate out of unused oil? I used a couple of bottles of my BC stash last night. I was trying to accurately blend two oils and was using a clear graduated cyclinder. I would dump the oil into the cyclinder and then leave the bottle upside down to allow the last drops to fall. The point of this intro it to explain that I could see the last drops very well when they hit the rest of the oil. To my surprise they were not clear like the rest of the oil. There was a sediment/precipitate in the bottom of the bottle. The last drops were milky. Were these last drops full of "crud"? Alternatively, is a portion of the additive package NOT in solution? If not in solution, did if precipitate or was it never in solution? I recall Terry suggesting at some point (an maybe in humor) that for a particular brand, one should shake before use. I think that comment may apply here.