I have a 3,450 mile sample of YB 5w20 from my Taurus en-route to Blackstone. They should have it by Monday or Tuesday and I will post results as soon as I get them. I am now running oil from my stash of Formula Shell 5w30. I plan on running a OCI or two of this and getting some 10w30 in it for a UOA and then going back to 5w30 for the fall/winter. I should note that my car did not self destruct when I poured the 5w30 in and it might be quieter, but only because I want it to be. Mileage appears to be the same.