I've spoken with oil company executives, service techs, electricians, suppliers, contractors, and oil company owners.
I've sat in boardrooms with the CEO's of the biggest home heating oil companies in the North East and helped deliver oil with some of the smallest Mom & Pop operations. Some had been in the business for generations and they had tips that actually helped people save money on their oil bills.
I found many home heating oil guys took this information for granted and never shared it.
They want you to use more oil because the more you use, the more they make.