I have an 09 Edge Limited with 1000 miles on it. I just changed the oil to 5w30 Full Synthetic. I couldn't find 5W20 where I live although ocassionly shows up and then soon disappears. I have been running 5w30 synthetic on my 2001 F150 since it's first oil change and now have 240,000 with no problems at all.
CAFE has specified 20 weight oils to try and slightly improve fuel efficiency. I see no reason why 5w30 cannot be used instead of 5w20. According to my local Ford dealer they have no concerns about its use even for warranty purposes. They "recommend" 5W20 however running 5w30 Mobile 1 synthetic is not going to void my warranty.
cheers,
Cam in Canada
