Join Date: Apr 2013
Location: NW New Jersey
Car Year: 2015
Car Model: Impreza 5-Door Sport
Transmission: Auto (CVT)
Feedback Score: 0 reviews
This is a pretty good idea to get an idea at least if using the heavier weight oil does make a difference.
Personally my '14 Forester with the 2.5i motor does not use any oil, at least not yet (5500 miles). So I cannot contribute to this poll.
I would have to assume though that the heavier weight oil will contribute to loss of miles per gallon. Subaru says to use 0W-20oil for a reason, not only for maximum lubrication, but also to attain maximum miles per gallon. How much of a loss of MPG is anyone's guess at this point.
So you have to weigh both issues, using a heavier weight oil to avoid oil consumption, but use more gas to do this.
Still though, it's worth a try.