I now use 5W20 in my Escape for one reason, and one reason only...Ford's warranty.
EPA/CAFE fuel economy and engine longevity are important issues, but frankly irrelevant to me while the vehicle is under warranty. At 10K miles I switched over to M1 5W30 for much of the logic expressed previously on these forums. Then I started reading about blown Escape engines on the Escape-Central owners site. See the postings in November forums about "blown engines" at http://www.escape-central.com/
In one of those threads one guy even claims his dealer sent the oil off for analysis before determining warranty coverage.
I own 4 different vehicles, and follow a different owners site for each. This is the only site where I've even found comments about failed engines, let alone failed engines so early in their life. No doubt the failure rate I'm reading about for Ford Duratec engines is not statistically different than the failure rate for other automitive engines. No doubt...
And I'm sure there are many other variables besides oil to explain things...like owner's driving habits, other improper maintenance, engine design issues, or a full moon! We'll probably never really know. But since I happen to own an Escape, I'm somewhat concerned.
Since then I VERY CAREFULLY re-read my Escape's warranty book, and switched back to 5W20. Ford clearly has a legal leg to stand on if they wanted to dispute warranty coverage due to a different oil being used than the one they recommend. I talked to my local Ford service manager before using 5W30. He said there would be no problem at the time, but thinking back on that conversation, his body language told me that he really didn't really want to even talk about the subject. Of course I have nothing in writing from him.
On Bill99gxe's oil spreadsheet I also noticed that the Ford and Honda analysis show some Moly in those factory-fill 5W20 oils. Yet the retail Motorcraft available today doesn't appear to contain Moly. So I'm still searching for the "best" available 5W20 out there.
This whole debate on 5W20 oil is a lot like the story of the chicken and the pig. The chicken may make a "contribution" to your breakfast with an egg, but the pig is "committed" with the bacon. Since I own one, and while under warranty, I'm now committed to 5W20 oil...oink!!!