What engine oil you guys use i just got my ls and looking to change the oil. I know its suppose to be 5w20 synthetic. Also have a question about this cooling fan fluid. Is that the same as the powersteering fluid because it smells and looks exactly like it. Called partsource and they don't know what engine cooling fan fluid is. Does it matter what kind of powersteering fluid i use because i always use best of the best stuff for my cars. Just wondering if i should EXACTLY follow the manual because everything is motorcraft stuff since ford owns it.