Had the head gasket replaced and metal machined due to HG failure. 2001 Forester, 120K miles. After I got it back, a bad oil smell. Cleaned and sprayed it, still there, though less; seems to be on drivers side. Comes in to cabin from the air vents below windshield when stopped.
Could it be the line from manifold vacuum to brake master cylinder ie servo amplifier? Or something else?
Should I worry? The car seems to get about 15 mpg, used to get 18 mpg, and the checkengine MIL is on.
Thanks if this reminds you of anything