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Well, I called Big O and the manager says they will put in 5W20 synth blend for me, no charge. He says they look up in "All Data" ? and it shows a 5W20 synth, 5W20 prem, and a 5W30 Ford Motor Part as the three oil choices for my '08 Edge. Since they dont stock the 5W20 oils, they put in the 5W30 as it is on the list. Strange. Also, I went to the Ford site https://www.fleet.fo...als/default.asp and there is no mention in the maintenance PDF about what specific oils should be in the car. But anyway, thanks for all your posts, very helpful. Cheers.

Thanks for the information. As I stated, I did review the owners manual, and I did click on the link you also sent me. Nothing in the book and the links were dead, hence my post.

Anyone know what the specs are, or if there is a requirement for the oil used in this car? Haven't given it much thought until Big O put a 5w/30w synthetic blend in today when my wife took it in for a change. "Its better for the car" was the reasoning. Has 38k on it. Is that the right weight? Can you go back to regular oil once a synthetic is used? Live in CO, car used mostly on hwy. Thanks for any information. Looked on the Ford Owners site, no specs, and their links to further docs are dead.