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Walmart can’t sell what they can‘t get. As far as Supertech being on the shelves, like any other product the name brand marketed goods are going to sell out first. Around me not even the parts stores have diesel oil on the shelves. Nothing at the farm stores, wholesale clubs or Amazon either...

That motor has been in service for over a decade and has been through two redesigns since their spec was introduced. It seems Ford has had plenty of opportunities to address any “design problems“ related to using a CK-4. I think the question to ask is what does Ford see that the other two in the...

I have a new 6.7l. It came from the factory with 10w30. I decided to go with 5w40 as Ford recommends it for severe duty. I am using T6. 15w40 appears to be going the way of 10w40. I do still use it in my old Ford tractor and skid steer though. Retailers have been slow to change their inventory...