As so many people here, I
As so many people here, I purchased a 2015 Subaru Forester and at 1200 miles the oil light came on. It took a full quart and I brought it to the dealer. I was surprised that the service guy and an admin person said the same thing, almost word for word as if it is something they have been told to say. Then I saw this forum and saw that I am not alone. I will be following up with the dealer for an oil consumption test but I saw one post mentioning that using 5w30 or 10w40 may make the oil consumption less because the oil is thicker and less likely to seep into faulty rings.
Will the 5w30 or 10w40 cause any other problem to the engine? Is there any other reason not to use this oil besides poorer fuel efficiency?