I ended up buying a 2008 C300 4matic sport a couple of months back and while driving the car you can notice a small oil burning smell. It's not too strong but it's noticeable. And you can smell it through the air vents. I've been watching underneath the car for oil leakage but there haven't been any oil spots under my car. I've also been noticing that under my hood and coming from my grill that there is a small amount of white smoke coming up and also from my passenger wheel area. I looked under my car today and noticed a small amount of oil gathering up on what I believe is the muffler. What could this issue be? I took it to the shop and had them look at it about a month ago and they found nothing. please help.