Castrol Marine has announced it is supplying environmentally responsible lubricants to International Shipping Partners (ISP), a global cruise ship management company. Headquartered in Miami, Florida, ISP offers ship owners a broad range of comprehensive passengership management services. ISP is the only dedicated passengership manager in the world to receive the industry’s highest quality assurance certification, the InterManager Quality Assurance Certificate. The agreement covers the use of Castrol BioStat, a range of stern tube lubricant grades formulated to deliver enhanced performance and reduced environmental impact when compared to conventional mineral oil equivalents.