25-04-16 light am, heavier pm

Date
intensity2, 3

11am

Oder in bathroom. Light

3pm

Just under vents. Light

11pm

Pervasive through whole house. Not strong but everywhere, no escape. Gross.

Air pressure dropped from 2021 to 2007 past 24 hrs. Trend to continue till 6pm tomorrow (2002)

Convinced that oil loads vent, and maintains the odor for some time..
Does it leave residue?