Nothing much to go on, I've had it for just over a year and it has about 120,000 miles.

It's simply running really loud. Not a weird noise, really. Almost as if I'm revving the engine, and there's also, maybe, a vibrating noise. It really only acts up when I go 30+ mph.

It's hard to explain. It started a few weeks ago, and I've had an oil change since then. Which didn't affect it.

I don't expect my car to last forever, so if it's something that won't kill the car tomorrow, I'm not too worried.

Please and thanks.