Any 0w20 will be fine. It does seem to be that those extending it to 7,500 notice the consumption more. The new 6,000mi interval is to minimize the perception of oil use. I started doing it in my OB just so the Mrs will not freak out. FYI, look at your warrant, Subie I think was still sneaking in 5 year, 60,000 powertrain warranty, so you might have to do it past 36K if you want to keep an warranty. I think that was the case for my '14OB... but I also had a goofy CPO where I bought a "used" vehicle that the dealer sold to themselves to meet a quota and put on a handful of miles.
The oil consumption is all over the place. I have a '14 OB, (and a '99), and going down the hall in my office, there is a 15 OB, an '12 OB, and a '15 Forester. From my small sample, I use a qt every 6K with Havoline, (which is about the same as my '99) and I do 80% city mileage. The '15 OB uses a quart every 3-4K with Mobil1 (90 highway but a BIG mountain climb), the '12 OB used minimal oil (M1), and the '15 Forester has yet to use enough over a long enough mileage to say for certain (on Dealer oil, likely Castrol).
The oil consumption is all over the place. I have a '14 OB, (and a '99), and going down the hall in my office, there is a 15 OB, an '12 OB, and a '15 Forester. From my small sample, I use a qt every 6K with Havoline, (which is about the same as my '99) and I do 80% city mileage. The '15 OB uses a quart every 3-4K with Mobil1 (90 highway but a BIG mountain climb), the '12 OB used minimal oil (M1), and the '15 Forester has yet to use enough over a long enough mileage to say for certain (on Dealer oil, likely Castrol).
