Subarus use a lot of oil and their sensors are pretty late to light up. If your engine hasn't been destroyed, check your oil at least once a month.
That said, you should tell the mechanic if you notice anything different about how it steers. Whether the noise gets louder when you are accelerating (like getting on the freeway) or slowing down. Does it only happen when the car is moving, or does it happen when the car is in park/neutral and you press the accelerator?
From this part of your description "louder as I drive faster, or accelerate and slight turn at the same time" it sounds like the 'constant velocity' (CV) joint on one or both of the front axles is going out.
Killer first post to a planted tank forum, huh? I expect to learn a lot on here, but cars are something I already know, so I guess I'm paying in advance for the education I expect to get here.
Good luck with your car. And keep an eye on your fluids, there aren't any automatic top off systems in cars yet.