I'll be assisting a friend of mine change oil on his new Ford. To keep the warranty intact we will go with a 5w-20 oil. Browsing the API site at http://eolcs.api.org/FindBrandByViscosity.asp?Viscosity=5W-20 it indicates Motorcraft has a full synthetic 5w20. I've never seen or heard of it. Anyone have info on this oil? I've seen the blend at Walmart, but never full synthetic.