I remember that picture showing some kind of sediment at the bottom of the Pennzoil jug. The bright plastic really helps contrast the sediment which was dark brown/gray or black, but a very small quantity, not enough to make anyone flip out. Most oil producers will tell you to shake and use, no issues. I'd argue if nearly any fluid sits long enough, something will eventually settle out. I shake my oil jugs every 3-4 months just to keep everything nicely blended, fortunately I do not have a huge stash.