This "Filling Station" ain't pretty. We find out right away how dirty it is, and Bishop doesn't ever let it go. Of course some amount of grease should be expected in a filling station, whose main service is oil changes. But Bishop seems to think it's worth explaining that this place is the greasiest of the greasy; the oil has permeated every object and every person (and pet) in the joint. Though the place is pretty gross looking, that doesn't necessarily make it altogether awful, though. While the opening judgment never really fades, Bishop makes room for a more complicated verdict on the station.
Bishop makes such a big deal about how dirty the filling station is, in order to make a proper contrast with the home element. She intentionally trashes the place in order to make the small, sweet spots really shine.
The speaker never changes her opinion about the place. From beginning to end she thinks it's a nasty hole, not habitable for human beings.