I tried searching for the SDS for Quaker State 5w-40 Euro on epc.shell.com but it doesn't show up.A few years ago the QS Euro had the same SDS as Ultimate Protection, 70-90% GTL, but now I can't find it and I did find a different one I have now lost that said 40% GTL. I dunno. I do know the add packs are dead ringers for each other.