Consultancy services rendered by persons, individually or collectively, as a member of an organisation requiring a high degree of mental activity and relating to the industry and/or the technology of engines, machinery lubrication and oil; services of surveillance, analysis, control, supervision, checking, monitoring and tests in connection with the state or condition of machinery and engines; analysis and diagnostic services for petrols, oils, greases and lubricants; advisory services relating to lubrication and maintenance of engines and machinery; test and monitoring services (inspection) for early damage detection in plant, machinery, equipment and systems containing, incorporating or conducting oils or petrols; all being services for third parties