This part of EN ISO 10438 specifies requirements for oil systems supplying lubricating oil to machines in generalpurpose applications for use in the petroleum, petrochemical and natural gas industries as well as in other industries by agreement. It is intended to be used in conjunction with EN ISO 10438-1. EN ISO 10438 in its entirety specifies requirements for lubrication systems, oil-type shaft-sealing systems, self-acting gas seal systems, control-oil systems and other auxiliaries for general- or special-purpose applications. These systems can serve equipment such as compressors, gears, pumps and drivers. General-purpose applications are limited to lubrication systems. None of the parts of EN ISO 10438 is applicable to internal combustion engines. Typical schemas for general-purpose oil systems are provided in Annex A.