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A faint burning-oil smell or a low-oil warning between changes is the Subaru complaint that shows up most — the boxer engine's head gaskets are prone to a slow weep, and consumption on earlier EJ-series engines is a known pattern, not neglect. It gets a compression and leak-down test before anything is resealed.
A boxer engine lies on its side instead of standing up, which means the head gaskets sit under the exhaust manifolds instead of on top of them — so instead of a puddle under the car, a Subaru with a weeping head gasket usually shows it as a faint burnt-oil smell after a highway drive and oil gone between changes that nobody remembers topping off. It's common enough on the earlier EJ-series engines that it gets checked before anything more expensive gets blamed for the same symptom.
The AWD system underneath is the other half of what makes a Subaru different to work on: the tires wear at close to the same rate the system was designed around, and a mismatched set from a shop that only replaced the worn ones can put uneven load through the center differential. That gets checked before a Subaru leaves with new tires, not after a comeback.
Is it normal for a Subaru to use oil between changes?
Some consumption is common on the boxer engine, particularly on the earlier EJ-series, and it isn't automatically a head gasket failure — a compression test and a leak-down test separate a gasket that's weeping from a ring pack that's just worn. The difference matters because one is a gasket job and the other is a much bigger one, and neither gets assumed without the test first.
Why does tire replacement matter more on an AWD Subaru?
Subaru's full-time AWD system expects the tires to stay within a close tread-depth match; replacing only the worn ones can load the center differential in a way it wasn't built for. It's a quick check with a tread-depth gauge, done before new tires go on rather than after something in the drivetrain starts complaining about it.
Is my Subaru burning oil because something is wrong?
Not necessarily — some oil consumption between changes is a known pattern on the boxer engine, especially the earlier EJ-series. A compression and leak-down test is how it's told apart from an actual head gasket failure, rather than guessing from the smell alone.
Can I replace just some of the tires on my Subaru?
It's checked case by case with a tread-depth gauge — the AWD system is sensitive to mismatched tread depth, and running an uneven set can put load through the center differential that it wasn't designed for.
How do you tell a head gasket leak from a valve cover leak?
Both can leave a similar oily smell, but they show up in different places and get confirmed with a leak-down test and a visual trace rather than replaced on a guess. Not every oil smell on a Subaru is the head gasket.