Is there any real difference between Shell and QS 5W20 syn oils?
I have an inventory of both and will probably end up with a couple of odd quarts when its used up. Would like to be able to mix them at some point on my Sorento.
Awhile back I asked a well known Sopus man on this site a very similar question in a PM.
He told me that the Shell syn is closer to QS syn than PP or PU and that mixing left-over Shell syn with QS was the better idea.
