ecoboost engine oil - blend or straight synthetic?
i did the search and scrolled down thru the posts and do not see if anyone has commented on the results of what oil they use in the ecoboost engine.
from the factory and at the dealer the blend is used. has anyone changed to straight synthetic say, mobil 1 and seen a difference in fuel economy?
i had my 5K oil change done at the dealer. when i come up to the 10K change i can get a free change at the dealer again but i am thinking maybe of doing it myself and putting mobil 1 in. im sure it would be better for the motor. but what about the mpg's?