This ambient sound effect was recorded with high quality sound equipment and comes from a sound library called Audi A4 B8 2.0 TDI which is pack of 171 high quality audio files with a total length of 158 minutes. In this library you'll find various engine sounds recorded onboard and from exterior perspectives, along with foley and other sound effects. You can use this sound for free, and if you need a whole package of ambients you can support my work and get it for 60$ here: <a href="http://soundholder.com/product/sound-library-audi-a4///" rel="nofollow">http://soundholder.com/product/sound-library-audi-a4///</a> Also here's a 10% discount code for all freesound users, just type : freesound in discount window. Enjoy!