Ford was one of the first manufacturers to spec. 5W-20 oil for it's vehicles. AFAIK, almost all ford vehicles still call for 5W-20 MC oil.
Other manufacturers that have also started to spec. 20-weight oils have gone further, and allowed or recommended 0W-20 oils as well - Toyota, Subaru, and Honda come to mind. they either recommend 5W-20, but allow for 0W-20, or they outright spec. 0W-20.
Why hasn't Ford gotton on the 0W-20 bandwagon? I know there isn't much difference between 5W-20 and 0W-20, but others are 'making use' of it being on the market.
My best guess is Ford spent a lot of time and effort encouraging the use of 5W-20, and they spent a lot of time and effort working with C-P to develop the much-loved MC 5W-20, so they don't want to confuse people...
Other manufacturers that have also started to spec. 20-weight oils have gone further, and allowed or recommended 0W-20 oils as well - Toyota, Subaru, and Honda come to mind. they either recommend 5W-20, but allow for 0W-20, or they outright spec. 0W-20.
Why hasn't Ford gotton on the 0W-20 bandwagon? I know there isn't much difference between 5W-20 and 0W-20, but others are 'making use' of it being on the market.
My best guess is Ford spent a lot of time and effort encouraging the use of 5W-20, and they spent a lot of time and effort working with C-P to develop the much-loved MC 5W-20, so they don't want to confuse people...