In any transaction involving a total volume of oil subject to payment pursuant to Section 48650 in excess of 10 gallons, the invoice or other form of accounting of the transaction shall identify the amount of the payment separately from the cost of the oil.
Source:
Section 48650.7, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PRC§ionNum=48650.7..