HF Sinclair Corporation announced July 28 that it plans to retire its base oil refining assets in Mississauga, Ontario, as part of a broader restructuring under which it intends to pursue the separation of its Lubricants & Specialties business into an independent, publicly traded company. The transition is expected to be substantially completed during 2027.

The announcement represents a significant potential change in the North American base oil supply structure. The Mississauga facility has production capacity of up to 15,600 barrels per day and is one of the largest manufacturers of Group III base oils in North America. The broader operation also produces base oils, process oils, specialty fluids, greases and finished automotive, industrial and food-grade lubricants.

The planned retirement does not mean HF Sinclair is withdrawing the Petro-Canada Lubricants brand from the market or closing all operations at the Mississauga site. According to the company, the Lubricants & Specialties business would retain a substantial presence in Ontario, including its research and development laboratory, lubricant blending and packaging operations, and supply-chain, logistics and commercial functions.

From Refiner to Base Oil Buyer

Following the retirement, the business would rely more heavily on externally sourced base oils. HF Sinclair said it has established strategic commercial agreements with two global base oil manufacturers, with those supplies supplemented by continued access to Group I and specialty products from HF Sinclair’s Tulsa, Oklahoma, refinery.

The company said the combination would allow the independent Lubricants & Specialties business to continue offering Group I, Group II and Group III base oils, as well as finished lubricants and specialty products.

The shift would effectively move a significant portion of the business from an integrated refining model—under which the company manufactures much of the base oil used in its products—to what HF Sinclair describes as a more capital-light operating structure. In practical terms, that model should allow Petro-Canada Lubricants to continue blending and marketing products without bearing the full capital requirements and operating exposure associated with owning the Mississauga base oil refinery.

At the same time, the business would become more dependent on commercial supply agreements, transportation networks and the availability of merchant base oil production.

Timing Is Noteworthy

The decision comes during an unusually tight and volatile period for the global base oil market. Group III prices have increased sharply in 2026 following disruptions to production and exports from the Middle East, while the Persian Gulf has historically been one of the world’s largest sources of Group III base oil for markets in Europe and North America.

Against that backdrop, the planned retirement of a major North American Group III facility is likely to receive close attention from lubricant manufacturers, distributors and other base oil buyers. The effect, however, would not be immediate. HF Sinclair expects the transition to take place over the course of 2027, providing time to establish inventories, distribution arrangements and replacement supply.

The company has not disclosed the identities of the two global base oil manufacturers involved in the new supply agreements, the volumes covered by those agreements or how much of the Mississauga facility’s capacity is currently dedicated to each base oil group and specialty product category.

For that reason, the plant’s 15,600-barrel-per-day capacity should not be interpreted as an equivalent reduction in Group III supply alone. The facility produces a broad range of base oils, specialty fluids and finished products, and actual output can vary with operating rates and product mix. Even so, the retirement would remove an important source of North American-produced, high-quality base oil from the market.

Lubricants Business to Be Separated

The refinery retirement is one component of a larger strategic transformation at HF Sinclair. The company plans to pursue a separation of its Lubricants & Specialties segment through the capital markets, which, if completed, would create an independent public company.

HF Sinclair expects the transaction to be completed within 12 to 18 months, subject to final board approval, regulatory requirements, financing and other customary conditions. The company said the independent lubricants business would retain its globally recognized brands, technology capabilities and extensive distribution channels while gaining greater financial flexibility and more consistent free cash flow.

The Lubricants & Specialties business includes Petro-Canada Lubricants, Red Giant Oil, Sonneborn, HollyFrontier Specialty Products and Industrial Oils Unlimited, which HF Sinclair acquired in January. HF Sinclair’s remaining business would concentrate on petroleum refining, midstream assets, branded fuel marketing and renewable diesel.

“This announcement marks an important step in HF Sinclair’s portfolio optimization strategy,” HF Sinclair Chairperson and Chief Executive Officer Franklin Myers said. He added that the separation is intended to create two more focused businesses with greater flexibility to pursue their respective capital and strategic priorities.

What the Market Will Be Watching

For lubricant manufacturers and distributors, the most important questions will concern where replacement Group II and Group III barrels originate, how they are positioned across North America and whether the new supply structure can provide the same product consistency, availability and logistical reliability historically associated with the Mississauga refinery.

HF Sinclair said the transformed business expects to improve service through a more conveniently located North American distribution network while maintaining its existing quality standards. Much will depend on the structure and duration of its supply agreements, the geographic locations of the replacement producers and the inventories maintained within the distribution system.

Petro-Canada Lubricants would continue operating, but the planned retirement marks the approaching end of an important chapter in North American base oil manufacturing—and a notable move away from refinery ownership by one of the region’s best-known lubricant suppliers.