Has anyone using the Motorcraft seen that the 5w-30 uses a foil type seal under the cap on the bottle where-as the 10w-30 does not ? How about you 5w-20 Motorcraft users , does it have a seal under the bottle cap ? Any ideas why the 5w-30 is sealed ? I think I know but it's only a guess . Waiting to see if the 5w-20 is sealed .