Hello again.

I have noticed for awhile now, on my way back into my neighborhood after driving 50-65 mph on the highway, I smell what smells like "vaporized" oil. Now, my car has 268K and it does NOT leak or burn any oil between the 3500 mile oil changes- which seems amazing for a 22 year old MB, with nearly 270,000 miles. I have drove up to 4000 miles before on one oil change, checked it and its completely full. So, I am wondering- whats this smell? Obviously its not burning oil since it is staying full, or it is so little, its not even noticable?

Perhaps something else in need of a change? Do these cars have PCV valves?

Thanks in advance!