Not sure how old this oil was, but it's rated SM. I've had it in my stash quite a long time I think. Just did a change on my son's 1999 Caravan and was surprised at the color of this old oil, kind of a rose/orange dark color. Was this normal for oil of this vintage? Can't remember... Bottles were all safety sealed and all had this same dark color. I know oil doesn't go bad with age but does it darken like this?