Originally Posted by Paul_RS
Originally Posted by Bullett
the cossies came from the factory running 5w30 fully synthetic.i have always run mine on this from ford.or an equivalent if i needed to and i was not near ford.
Are you sure? Says in the manual to run them on nothing but 5W50 synthetic oil.
ive always been supplied the 5w30 by ford themselves. 148k later its still fine
ben as lon as the grade is the same and its a synthetic it will mix fine mate