Hey guys I just dumped in a bottle of Lubegard Red in my 99 GMC Sierra with a 4L60E, but at the bottom of the bottle I noticed this gray film/residue. Is this normal, or did someone use up the bottle and then throw their old tranny fluid in it? It smelled like ATF and appeared red, the seal seemed OK, but not super tight when I took it off. Or, is that just the additives settling? Thanks.