This part of EN ISO 10438 in conjunction with of EN ISO 10438-1 specifies requirements for oil systems for specialpurpose applications. These oil systems can provide lubrication oil, seal oil or both. EN ISO 10438 in its entirety specifies requirements for lubrication systems, oil-type shaft-sealing systems, dry-gas face-type shaft-sealing systems and control-oil systems for general- or special-purpose applications. These systems may serve equipment such as compressors, gears, pumps and drivers. EN ISO 10438 (all parts) is intended to be used for services in the petroleum, petrochemical and natural gas industries as well as other industries by agreement. EN ISO 10438 (all parts) does not apply to internal combustion engines.