Those in Lakewood who are up to the lofty standards of Lakewood Shel Maalah are enveloped by the Annanei HaKavod and supplied Maan.
By asking about heating oil or even shopping in their stores you show that you are not part of the Lakewood Shel Maalah.
This why some object to sit down restaurants in Lakewood. They do not want to advertise that there people who are not Ochlei Ha-maan in the city.
Hence, heating oil needs to be delivered be-Tzinah (quietly privately).