I just did an oil change the hard way by removing all the panels below the car and replace the oil filter. The oil was pretty dark once I drained it out.

My car now sounds different like it's sucking in air or hissing. It drives like normal, but noise is a bit different.

I recorded the sound. The air sucking noise is a bit hard to hear in the video thought. Is this normal?

http://youtu.be/7kf3FutOPl4

 

make sure none of the plastic under the car is flopping around thats my first guess. look for leaks without the AC on :p idle it for a few mins look around with a flashlight. i replaced my air filter didn't put the panel back on top of the engine right got a light immediately fixed that. good luck

 

this is random, but this sound is the closest i can find on youtube:

 

my cars brake booster is on it way out i have a tiny vacuum noise just waiting to get the new one installed soon. does it make the sound when it idles

 

how long r u waiting for oil changes?

last time i got an oil change my car sounded better...exactly like u said

i wouldnt be worried