I have a 2006 S4 Avant and sometimes after the car has been driven on the highway, I can smell a faint smell of burning oil around the front of the car. The same happens for a coolant smell.

There are no drips of oil or coolant on my garage floor.

I would appreciate any suggestions on how to track down the issue and repair.

Thanks!

 

The radiator is probably starting to leak around the crimp connections on either side for the cores where it meets the plastic reservoirs. G12 will leave an orange-white residue that is fairly easy to see. It's probably not leaking enough to make it to the ground yet.