1.1 This Gulf standard is concerned with the requirements to be met in CL lubricating oils. 1.2 CL lubricating oils are used in circulating lubrication systems in cases where a higher resistance to aging or a higher degree of corrosion protection than for C lubricating oils as specified in GSO standard (item 2.9). 1.3 CL lubricating oils should be used for application where water – induced corrosion is to be expected and in the case where high thermal stresses would result in an unduly short service life if C lubricating oils were used.