Castrol Syntilo 9913 is an oil-rejecting synthetic fluid specifically formulated for machining and grinding aerospace aluminum, titanium and other aerospace alloys. Syntilo 9913 has full Boeing, Airbus, and Bombardier approval. Unlike traditional synthetic fluids, Syntilo 9913 has a neutral pH to prevent staining of sensitive aerospace alloys and promote operator acceptance. Syntilo 9913 contains a combination of surfactant chemistries that offer superior lubrication and excellent cooling properties. The severe machining capabilities of Syntilo 9913 make it an excellent choice for other aluminum alloys as well, especially when diamond tooling is used.