On November 2, BP announced the completion of its sale of a 65% stake in its lubricant brand Castrol to US investment firm Stonepeak.
The transaction values Castrol at an enterprise value of about $10.1 billion. BP received about $6 billion in after-tax net proceeds and retains a 35% stake.
Stonepeak is an infrastructure investor and has no horizontal business overlap with Castrol, so the antitrust review did not trigger asset divestitures. In April 2026, China's State Administration for Market Regulation granted unconditional clearance; in June, the European Commission approved the deal under its simplified procedure.
BP's net debt stood at $13.87 billion as of the end of September, already below the company's target range. The $6 billion from Castrol will be used to further reduce financial liabilities, including ordinary debt, hybrid bonds, lease liabilities and compensation for the Deepwater Horizon oil spill.
BP is also working on several other asset sales. In July 2026, it completed the sale of the Gelsenkirchen refinery in Germany, and sale processes for UK North Sea oil and gas assets and the Archaea biomethane business have been launched.
BP has updated its full-year divestment proceeds expectation to $8 billion, with the $6 billion from Castrol being the largest component. Its larger goal is to raise $20 billion through divestments by the end of 2027 and shrink its portfolio to upstream oil and gas, downstream convenience retail and trading.
After a two-year lock-up period, BP has the right to sell the 35% stake. In the short term, it will be held as an equity-method investment, with no gains recognized and no dividends received.
Stonepeak manages about $98 billion in assets, mainly investing in digital infrastructure, energy and energy transition, transport and logistics, and real estate. Its style is defensive hard assets, seeking downside protection and risk-adjusted returns. Its reason for buying Castrol is not that "lubricants are a good brand," but that lubricants are mission-critical products and a prerequisite for the normal operation of vehicles, machinery and industrial processes.
Investors increasingly view companies like Castrol as industrial infrastructure embedded in the global economy rather than as consumer brands. The brand is the surface; the underlying asset is a manufacturing and distribution network covering more than 150 countries, about 20 blending plants and more than 100 third-party facilities.
Castrol's growth narrative is also moving closer to infrastructure. Traditional engine oil demand is affected by EV penetration, and the company is expanding into new areas such as EV fluids and data center coolants. CPP Investments contributed up to $1.05 billion in the transaction for an indirect interest; its investment logic explicitly cites electrification, digital infrastructure and specialized industrial processes.
Castrol ranks third in the global lubricant market. In China's overall lubricant market, it accounts for about 4%, and in the premium segment its share reaches 8%. After the transaction, Castrol remains Castrol - only its controlling shareholder has changed from an oil company to an infrastructure fund.
