Joining the Subaru problems club…
Intermittently our 05 Subaru has a roaring noise like a mud tire on a truck or maybe louder than a snow tire noise. It then goes away. It ranges from 30MPH-highway speeds
The car does has really new(<1000 miles) tires known to be relatively quiet(Continental Extreme Contact DWS).
Is this a wheel bearing noise. I only ask as I have a letter from Subaru extending the warranty on the rear 8yrs/100k.
Wheel bearings would be the first thing that I would check–especially since defective bearings would be replaced at no charge to you.
Does the pitch of the sound change when the steering wheel is moved off-center (i.e. changing lanes)? That’s a good indication of a bad wheel bearing(s). The viscous clutch on my 95 Dakota’s fan would make a roaring noise occasionally, but I assume you have an electric fan on the Subaru.
Ed B.