I love thos forum. I do have a question as I see all these threads about this one is better then that one or they are all good and you can't go wrong no matter what you choose. Years back someone posted that it is better for your engine to stick with one brand because the add pack doing its job gets compromised when you put in a different brand that had an add pack that works differently resulting in less protection. Yet I see people changing brands all the time, mixing brands when they top off, consolidating jugs of oil into one jug, etc.. I also do this occasionally. Is this no longer an issue of concern? Or was it every really an issue in the past?