My 3.7 liter Duratec MKT is coming due for an oil change. It actually has Warrens Euro 5W40 blend in there which will promptly get sent to Blackstone. Ive decided to give Warren 5W30 a run and lets see how this goes. Amazon seems like the easiest way to get a six pack. Noted that Amazons pricing is slightly less than Walmart Supertech.