hi i recently bought a 98 a4 with 100,000 miles on it. im 17 and its my first car and i dont no that much about it yet. i recently noticed a burning oil smell when my car heats up. i check for oil leaks and i have none. i can only smell the burning oil smell when i have the heat on or i open the hood. the smell is starting to worry me does anyone have any idea of what it might be. any suggestions would greatly be appreciated.