{"id":17463,"date":"2026-08-28T12:24:29","date_gmt":"2026-08-28T10:24:29","guid":{"rendered":"https:\/\/revija-ventil.si\/tribological-and-functional-limitations-of-universal-engine-oils-in-hydraulic-systems\/"},"modified":"2026-08-28T12:31:18","modified_gmt":"2026-08-28T10:31:18","slug":"tribological-and-functional-limitations-of-universal-engine-oils-in-hydraulic-systems","status":"publish","type":"post","link":"https:\/\/revija-ventil.si\/en\/tribological-and-functional-limitations-of-universal-engine-oils-in-hydraulic-systems\/","title":{"rendered":"Tribological and functional limitations of universal engine oils in hydraulic systems"},"content":{"rendered":"

[et_pb_section fb_built=”1″ admin_label=”section” _builder_version=”4.27.4″ global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_row column_structure=”3_4,1_4″ use_custom_gutter=”on” gutter_width=”2″ admin_label=”row” _builder_version=”4.27.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” global_colors_info=”{}” theme_builder_area=”post_content”][et_pb_column type=”3_4″ _builder_version=”4.27.4″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||” theme_builder_area=”post_content”][et_pb_post_title author=”off” date_format=”j. F, Y” categories=”off” comments=”off” featured_image=”off” admin_label=”Post Title” _builder_version=”4.27.5″ title_level=”h2″ custom_margin=”||30px||false|false” custom_margin_tablet=”||20px||false|false” custom_margin_phone=”” custom_margin_last_edited=”on|desktop” custom_padding=”||||false|false” global_module=”11762″ saved_tabs=”all” global_colors_info=”{}” theme_builder_area=”post_content”][\/et_pb_post_title][et_pb_text content_last_edited=”off|desktop” admin_label=”Avtor” _builder_version=”4.27.8″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” min_height=”21px” custom_margin=”||10px||false|false” custom_margin_tablet=”||||false|false” custom_margin_phone=”||10px||false|false” custom_margin_last_edited=”on|desktop” custom_padding=”0px||0px||false|false” custom_padding_last_edited=”off|desktop” hover_enabled=”0″ use_border_color=”off” global_colors_info=”{}” theme_builder_area=”post_content” sticky_enabled=”0″]<\/p>\n

Izr. prof. dr. Franc Majdi\u010d, univ. dipl. in\u017e., Univerza v Ljubljani, Fakulteta za strojni\u0161tvo<\/p>\n

[\/et_pb_text][et_pb_text admin_label=”Tip \u010dlanka” _builder_version=”4.27.8″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” custom_margin=”||25px||false|false” custom_margin_tablet=”” custom_margin_phone=”” custom_margin_last_edited=”on|phone” custom_padding=”||0px||false|false” hover_enabled=”0″ use_border_color=”off” global_colors_info=”{}” theme_builder_area=”post_content” sticky_enabled=”0″]<\/p>\n

Ventil 32 (2026) 4 \/ Review articles \/ Technical article \u2013 1.04<\/p>\n

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DOI: https:\/\/doi.org\/10.5545\/Ventil-32-2026-4.30<\/a><\/p>\n

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Abstract\u200b:
<\/strong>Universal motor oil can also function satisfactorily as hydraulic oil. However, if universal motor oil is used as hydraulic oil solely because of its high viscosity index (VI) \u2013 that is, because of its stable kinematic viscosity regardless of temperature changes \u2013 then this is not the right solution. This is, of course, related to the additives that increase the viscosity index. These additives are relatively large molecules that do not thicken the oil at low temperatures, but at higher temperatures form long molecular chains, which consequently increase the kinematic viscosity of the oil. The first viscosity index improvers, used in 1940, were made from melted rubber and were suitable for use in motor oil. Viscosity index improvers have been greatly refined over years of development. However, even today they remain sensitive to shear stresses during pumping. From the perspective of shear stresses, hydraulic fluids are subjected to the highest loads, which is why Group VI improvers are used.<\/p>\n

<\/p>\n

Key words:
<\/strong>engine oil, hydraulic oil, additives, viscosity index<\/p>\n

<\/p>\n

Copyright (c) 2026 Franc Majdi\u010d
<\/strong>
\"\"<\/a><\/p>\n

<\/p>\n

This work is licensed under a
Creative Commons Attribution 4.0 International License<\/a>.<\/p>\n

<\/p>\n

Except where otherwise noted, articles in
this journal are published under the
Creative Commons Attribution 4.0 International License<\/a>.<\/a><\/p>\n

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Universal motor oil can also function satisfactorily as hydraulic oil. However, if universal motor oil is used as hydraulic oil solely because of its high viscosity index (VI) \u2013 that is, because of its stable kinematic viscosity regardless of temperature changes \u2013 then this is not the right solution. This is, of course, related to the additives that increase the viscosity index. <\/p>\n","protected":false},"author":5,"featured_media":17429,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[153,154],"tags":[],"class_list":["post-17463","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exposed-articles","category-science-and-expert-articles"],"yoast_head":"\nLimitations of universal engine oils in hydraulic systems - Ventil<\/title>\n<meta name=\"description\" content=\"Universal motor oil can also function satisfactorily as hydraulic oil. 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