Chevron makes its own additives, and its own base oil. Here is the AI summary. Though unpopular here:
Chevron primarily uses in its own products (e.g., Havoline, Delo, Chevron Supreme):
- Its proprietary Group II and Group II+ ISOSYN® base oils.
- Group III UCBO (Unconventional Base Oil): Used in Chevron-branded synthetic and synthetic blend motor oils.
- NEXBASE® Group III oils: Also used internally, especially in premium synthetic formulations.
Chevron maintains a vertically integrated model—supplying its own brands while also selling base oils and additive packages (via Chevron Oronite) to external customers.
My conclusion is that Havoline Pro D/S is a sleeper premium oil, that is the pride of the company, that isn't widely marketed, because that would cut into the business of it's customers for its additives and base oils, like maybe, the Valvolines of the world.