Castrol Rustilo™ 637 (previously called SafeCoat™ 637) is a general purpose short term inhibited protective oil ideal for use where solvent based products are unacceptable.Rustilo 637 is especially recommended in cold rolling mills, rod and wire drawing works. Due to good deep drawing properties Rustilo 637 is also suitable for the protection of cold rolled vehicle body sheets light forming operations. Rustilo 637 can also be used as testing liquid for hydraulic equipment as well as leakage testing fluid for gears, pumps and tanks.