I'll repeat this tomorrow going to & from work. No signs of any leaks appeared in the areas that I cleaned off either. Coming back from work with a fresh bit of the cardboard underneath the pump, I didn't get the smell and no new stain appeared on the cardboard. I noticed the smell after getting off the highway in the morning too. After driving to work (about 50 miles), the cardboard looked like it had just a slight stain, possibly just from the de-greaser. I also stuck a piece of cardboard bent into a "U" shape under/around the vacuum pump to see if it collected anything. Well, I sprayed the whole area down with a de-greaser this morning and wiped the vacuum pump, valve cover, and valve cover-to-head flange down to clean things up this morning. Has anyone experienced something like this? Are there any oil sources that I'm forgetting? I can't think of any other oil source in back of the engine that could make its way to the exhaust. It seems that it could only be from the valve cover gasket, oil lines to the turbo, or potentially the transmission output seals. My hypothesis is that the turbo, catalyst and exhaust are getting nice and toasty on the highway, and when I pull off there is some oil leak or oil being thrown by a belt, driveshaft etc that burns off on the hot exhaust, and I can only smell it when the exhaust is still hot enough and the air around the car is suddenly still. The past few days, I've pulled off of the road right after getting off the highway and popped the hood, but could see no signs of an oil leak or smoke, nor could I smell it outside the car. At first I thought it was diesel exhaust - it wasn't too strong and wasn't accompanied by any smoke, but it occurs too frequently and repeatably to be pulling up behind a diesel vehicle right after getting off of the highway. ![]() The past two weeks, I've started to notice a faint burning oil smell getting into the cabin only after getting off of the highway.
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