BP Castrol K.K. (5015.T) manufactures, imports, develops, and sells automotive lubricants under the Castrol and BP brands in Japan; its core products include gasoline engine oils, diesel engine oils, automotive gear oils, automatic transmission fluids (ATF) comprising continuously variable transmission (CVT) fluids, brake fluids, radiator fluids, and car care products. The company serves passenger car, motorcycle, and commercial vehicle markets through consumer channels such as car shops, home improvement centers, and tire shops, as well as B2B channels including domestic and imported car dealers and auto repair shops. Founded in 1978 and headquartered in Tokyo's Shinagawa-ku at Gate City Osaki East Tower, BP Castrol K.K. operates as a subsidiary of Castrol Limited, which is ultimately controlled by BP p.l.c. with a 64.83% stake. In recent developments, the company reported strong nine-month results for 2025 through September 30, with revenue rising to Y10.67 billion from Y9.60 billion and net profit increasing to Y758 million from Y687 million, driven by robust sales growth and operational efficiency. Amid parent BP p.l.c.'s strategic review of its Castrol lubricants business—which began in early 2025 and attracted interest from firms like Stonepeak, Reliance Industries, Apollo Global Management, and others—no divestment has impacted the Japanese subsidiary to date, maintaining its focus on the domestic automotive lubricants sector.