Last year the U.S.S Cod submarine in Cleveland was towed to Erie, PA to be dry docked. And have a bunch of rusty exterior areas fixed. Probably to prevent the above from happening.
Should be A-ok and I wouldn't hesitate using it. Even M1 can have a tendency to burn off esp when changing over to it. But hard to pass up M1 when the rebates are going.
Buy from dealer, Rockauto, or even auto parts store. Not worth saving a few bucks to get fakes. Same thing applies with other auto parts especially wheel bearings.