Originally Posted by scott7278
Ford will tell you Motorcraft, but in reality, you only need to meet or exceed the Ford specification WSS-M2C945-A. For warranty purposes especially, you want to make sure of this - there would be few things worse than getting a warranty claim on an engine denied because a non-approved oil was used.
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For an engine warranty to be denied because of a non-approved oil being used, it has to be proven that whatever damage occurred was due specifically to the oil. If the oil didn't cause the problem, the warranty claim can't be denied. This is federal law. Google --> Magnuson Moss Warranty Act.