First time poster, thanks for your help.
Just purchased a used 2011 Subaru Outback 2.5i limited. Approx. 35k miles. No history of serious maintenance issues as far as I (and Carfax) am aware.
The car starts just fine, with no apparent issues or strange noises. Then, once the car is shifted into reverse or drive, I hear a soft but persistent “cowbell/wood block” noise from front (left?) of the vehicle. The noise seems to be agitated by pressing and releasing the brake or accelerator. It gains in frequency with the speed of the car, regardless of whether I am on the gas or just coasting. It is most noticeable up to about 25 mph, when it is overwhelmed by road noise.
Once the car runs for about 20 minutes, the sound is gone, at all speeds. But if the car is parked for about hours, the problem begins anew.
I reported the problem at my last oil change, but because the dealer is over 20 minutes away, the noise is hardly noticeable once I get there.
Although the noise itself is annoying, I am more concerned that it is an early sign of something more significant to come. As you can see, I only have about a thousand miles left on my bumper-to-bumper warranty.
Thanks for any and all ideas you may have.