{"id":16686,"date":"2023-01-25T12:09:51","date_gmt":"2023-01-25T11:09:51","guid":{"rendered":"https:\/\/ecol.eu\/baza-wiedzy\/visual-evaluation-of-oil-color\/"},"modified":"2025-07-07T12:26:11","modified_gmt":"2025-07-07T10:26:11","slug":"visual-evaluation-of-oil-color","status":"publish","type":"post","link":"https:\/\/ecol.eu\/en\/knowledge-base\/visual-evaluation-of-oil-color","title":{"rendered":"Visual evaluation of oil color"},"content":{"rendered":"<header class=\"page-hero alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"col-lg-7 offset-lg-1 page-hero__text\">\n\n        <nav aria-label=\"Okruszki\" role=\"navigation\">\n  <ul class=\"breadcrumbs\" aria-label=\"lista okruszk\u00f3w\">\n\n    \n      <li class=\"breadcrumbs__item\">\n\n                  <a href=\"https:\/\/ecol.eu\/en\/\" class=\"breadcrumbs__link\">Home page<\/a>\n        \n      <\/li>\n\n    \n  <\/ul>\n<\/nav>\n\n        <h1 class=\"heading heading--sb\">Visual evaluation of oil color<\/h1>\n\n                  <p class=\"desc\">Regular oil analysis, is one way to prevent failures. In an effort to share knowledge, we are publishing another pill of information on lubricant diagnostics.<\/p>\n        \n      <\/div>\n\n      <ul class=\"col-lg-7 offset-lg-1 links\" data-links><\/ul>\n\n    <\/div>\n\n    \n      <svg class=\"page-hero__bg page-hero__bg--labs\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 524.67 1037.03\"><defs><style>.cls-1{stroke-width:.5px;}.cls-1,.cls-2{fill:none;stroke:#1d1d1b;stroke-miterlimit:10;}.cls-1,.cls-3{fill-rule:evenodd;}.cls-3{fill:#1d1d1b;}<\/style><\/defs><path class=\"cls-2\" d=\"M8.83,964.9L.51,291.36c-.25-20.07,6.48-39.7,19.4-55.06,16.3-19.38,46.07-40.55,100.33-50.92v-37.42\"\/><ellipse class=\"cls-2\" cx=\"266.5\" cy=\"966.98\" rx=\"257.67\" ry=\"69.54\"\/><path class=\"cls-2\" d=\"M126.34,949.72c-21.5,6.33-34.26,14.22-34.26,22.78,0,12.88,28.89,24.25,72.95,31.04\"\/><path class=\"cls-2\" d=\"M206.26,1008.18c16.98,1.29,35.18,1.99,54.11,1.99,92.94,0,168.28-16.86,168.28-37.66,0-5.99-6.25-11.66-17.38-16.69\"\/><path 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d=\"M342.7,435.67h7.66s0,17.56,0,22.96c0,2.15,1.16,2.84,2.64,2.86h1v7.58h-1c-5.7,0-10.3-4.67-10.3-10.27v-23.13Z\"\/><path class=\"cls-3\" d=\"M269.81,469.06c4.58,0,8.32-3.6,8.32-8.01,0-2.28-.88-4.19-2.6-5.81h-.01v-.02l-5.7-5.43-5.54,5.27c-1.59,1.52-2.79,3.61-2.79,5.98,0,4.41,3.74,8.01,8.32,8.01Z\"\/><path class=\"cls-3\" d=\"M254.13,469.06c2.81,0,5.31-1.36,6.82-3.43-.77-1.37-1.21-2.94-1.21-4.61s.43-3.22,1.2-4.58c-.43-.56-.53-.71-1.08-1.2h-.01v-.02l-5.7-5.43-5.54,5.27c-1.66,1.55-2.79,3.61-2.79,5.98,0,4.41,3.74,8.01,8.32,8.01Z\"\/><\/g><path class=\"cls-1\" d=\"M253.37,500.31s190.86,8.82,256.91-41.51\"\/><\/svg>\n\n    \n  <\/div>\n<\/header>\n\n\n\n<div style=\"height:52px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <p class=\"post__paragraph\">Regular oil analysis is one way of preventing machinery breakdowns. Unplanned downtime becomes the cause of increased operating costs and lost earnings due to production downtime. In an effort to share knowledge, we are publishing another information pill on lubricant diagnostics.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"see-also alignwide\">\n\t<div class=\"see-also__content container\">\n\t\t<div class=\"row justify-content-center\">\n\t\t\t<div class=\"see-also__text-content offset-lg-1 offset-md-0 col-lg-9\">\n\n\t\t\t\t<div class=\"see-also__heading see-also__heading--image\">\n\n\t\t\t\t\t\t\t\t\t\t\t<figure class=\"see-also__image-wrapper\">\n\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/10\/ecol-badania-olejow-smarow-miniatura2-e1696487249591.webp\" alt=\"\" loading=\"lazy\">\n\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\n\t\t\t\t\t<div class=\"see-also__details\">\n\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"desc\">The author of the article is a&nbsp;lubricant diagnostician with many years of experience,\r\nJakub Kubacki, who works on a&nbsp;daily basis at the Ecol Oil Analysis Laboratory<\/p>\n\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n<\/section>\n\n\n\n<div style=\"height:41px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">visual assessment \/ oil colour<\/h2>\n<p class=\"post__paragraph\">Most commonly used oils, when fresh, are clear, colourless liquids, through straw to brown in colour. Users expect oils to retain their properties for as long as possible.<\/p>\n<p class=\"post__paragraph\">However, it is not uncommon, even after a\u00a0relatively short period of use, to notice alarming visual changes that may indicate a\u00a0deterioration of operational parameters. The most frequent symptoms of poor oil condition noticed by users are cloudiness or rapid change of oil colour.<\/p>\n<p class=\"post__paragraph\">In such a\u00a0situation, the right thing to do is to undertake diagnostic activities leading to the identification of the cause of the changes and, consequently, minimising the risk of inconvenient, expensive repairs and unplanned downtime.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">turbidity<\/h2>\n<p class=\"post__paragraph\">Oil turbidity can range from a\u00a0slight haze to a\u00a0milky appearance to the appearance of a\u00a0mayonnaise-like substance. It signals the formation of an emulsion \u2013\u00a0an arrangement of immiscible liquids, of which the dispersed liquid appears as droplets so small as to be indistinguishable to the unaided eye, giving the impression of a\u00a0homogeneous substance. Due to the limited stability of the emulsion, phase separation is observed over time, especially during standstill, when the mixing effect due to the operation of the equipment ceases.<\/p>\n<p class=\"post__paragraph\">A potential cause of oil turbidity is water contamination. Although it is a\u00a0well-known fact that oil and water do not mix, in practice it is impossible for a\u00a0working oil to be completely water-free. Oil systems are never perfectly tight, even though they may appear to be so \u2013\u00a0so the phenomenon of absorption of water vapour from the air occurs. It should also be remembered that water vapour tends to condense on the metal surfaces of machine components when they are subjected to varying temperatures and this also contaminates oils.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"tiles  gallery alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"offset-lg-2 col-lg-5\">\n\n        \n        \n        \n      <\/div>\n\n      \n        <div class=\"offset-lg-2 col-lg-9 tiles__items\">\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-probka-olej-hydrauliczny.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"ecol-probka-olej-hydrauliczny\" data-description=\"olej hydrauliczny HV 46 krytycznie zanieczyszczony wod\u0105\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-probka-olej-hydrauliczny.jpg\" class=\"tiles__image\" alt=\"olej hydrauliczny HV 46 krytycznie zanieczyszczony wod\u0105\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>olej hydrauliczny HV 46 krytycznie zanieczyszczony wod\u0105<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-probka-olej-obiegowy.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"ecol-probka-olej-obiegowy\" data-description=\"olej obiegowy krytycznie zanieczyszczony wod\u0105 (widoczny rozdzia\u0142 faz)\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-probka-olej-obiegowy.jpg\" class=\"tiles__image\" alt=\"olej obiegowy krytycznie zanieczyszczony wod\u0105 (widoczny rozdzia\u0142 faz)\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>olej obiegowy krytycznie zanieczyszczony wod\u0105 (widoczny rozdzia\u0142 faz)<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n        <\/div>\n\n      \n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <p class=\"post__paragraph\">The water content in oils, in properly functioning equipment, depending on the type of application and operating conditions, can range from a\u00a0few to several hundred ppm (parts per million) for hydrocarbon-based oils (mineral or synthetic oils based on polyalphaolefins) or even several thousand ppm for oils based on polyalkylene glycols, without causing an increased risk of sudden failure, intensive corrosion processes or sludge formation. Water causes oil turbidity \u2013\u00a0it forms emulsions when its content exceeds the saturation point.<\/p>\n<p class=\"post__paragraph\">Turbidity can also be caused by incorrect oil refilling, when oils of different types, which are incompatible with each other, are mixed by mistake. In our laboratory practice, we sometimes come across samples of extreme mistakes, such as adding coolant to an oil system, which is not at all uncommon.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">change of colour<\/h2>\n<p class=\"post__paragraph\">Visual assessment can be an effective indicator of contamination of a\u00a0lubricant by another substance. It is important to remember that it is a\u00a0natural phenomenon for oil to change colour over time. Oil base molecules exposed to aggressive factors (increased temperature, moisture, oxygen from the air, etc.) become partially oxidised according to the reaction [1]:<\/p>\n<p class=\"post__paragraph\">R-H \u2192 R\u2022 +\u00a0H\u2022<\/p>\n<p class=\"post__paragraph\">R\u2022 +\u00a0O2 \u2192 ROO\u2022<\/p>\n<p class=\"post__paragraph\">ROO\u2022 +\u00a0R-H \u2192 ROOH +\u00a0R\u2022<\/p>\n<p class=\"post__paragraph\">ROOH \u2192 RO\u2022 +\u00a0HO\u2022<\/p>\n<p class=\"post__paragraph\">RO\u2022 +\u00a0RH \u2192 ROH +\u00a0R\u2022<\/p>\n<p class=\"post__paragraph\">HO\u2022 +\u00a0RH \u2192 H2O +\u00a0R\u2022<\/p>\n<p class=\"post__paragraph\">The above chain reaction can run further. Condensation and polymerisation reactions leading to the formation of macromolecular products are possible. The resulting oxygenated compounds differ from the molecules in the oil base by their electric dipole moment, but tend to orient themselves with each other\u2019s functional groups (R-COOH \u2014 HOOC-R) and consequently the resulting micelles are soluble in the oil base up to a\u00a0certain critical mass.<\/p>\n<p class=\"post__paragraph\">Wear processes occurring in operating oil systems are responsible for the formation of very fine metallic particles. These particles are collected by the oil and remain in the oil circuit even despite the use of oil filtration systems. For each type of equipment, there is a\u00a0certain acceptable content of metallic particles. However, in the case of intensive, uncontrolled wear and tear, metallic particles suspended in the oil rapidly darken the oil until it appears completely black. A similar effect is produced by contaminants entering the oil system, such as dust or dirt from the environment or fragments of aged seals.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"tiles  gallery alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"offset-lg-2 col-lg-5\">\n\n        \n        \n        \n      <\/div>\n\n      \n        <div class=\"offset-lg-2 col-lg-9 tiles__items\">\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-olej-przekladniowy.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"ecol-olej-przekladniowy\" data-description=\"pr\u00f3bka oleju przek\u0142adniowego pobrana oko\u0142o 3 miesi\u0105ce po wymianie w celu identyfikacji przyczyny zmiany barwy\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-olej-przekladniowy.jpg\" class=\"tiles__image\" alt=\"pr\u00f3bka oleju przek\u0142adniowego pobrana oko\u0142o 3 miesi\u0105ce po wymianie w celu identyfikacji przyczyny zmiany barwy\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>pr\u00f3bka oleju przek\u0142adniowego pobrana oko\u0142o 3 miesi\u0105ce po wymianie w celu identyfikacji przyczyny zmiany barwy<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-zdjecie-membrany-filtracyjnej-x40.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"ecol-zdj\u0119cie-membrany-filtracyjnej-x40\" data-description=\"zdj\u0119cie membrany filtracyjnej 1,2\u00b5m, zoom x 40 - widoczne cz\u0105stki \u015bcieru metalicznego b\u0119d\u0105cego przyczyn\u0105 problemu\n\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-zdjecie-membrany-filtracyjnej-x40.jpg\" class=\"tiles__image\" alt=\"zdj\u0119cie membrany filtracyjnej 1,2\u00b5m, zoom x 40 - widoczne cz\u0105stki \u015bcieru metalicznego b\u0119d\u0105cego przyczyn\u0105 problemu\n\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>zdj\u0119cie membrany filtracyjnej 1,2\u00b5m, zoom x 40 &#8211; widoczne cz\u0105stki \u015bcieru metalicznego b\u0119d\u0105cego przyczyn\u0105 problemu\n<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-zdjecie-membrany-filtracyjnej-x100.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"ecol-zdj\u0119cie-membrany-filtracyjnej-x100\" data-description=\"zdj\u0119cie membrany filtracyjnej 1,2\u00b5m, zoom x 100 - widoczne cz\u0105stki \u015bcieru metalicznego b\u0119d\u0105cego przyczyn\u0105 problemu\n\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/ecol-zdjecie-membrany-filtracyjnej-x100.jpg\" class=\"tiles__image\" alt=\"zdj\u0119cie membrany filtracyjnej 1,2\u00b5m, zoom x 100 - widoczne cz\u0105stki \u015bcieru metalicznego b\u0119d\u0105cego przyczyn\u0105 problemu\n\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>zdj\u0119cie membrany filtracyjnej 1,2\u00b5m, zoom x 100 &#8211; widoczne cz\u0105stki \u015bcieru metalicznego b\u0119d\u0105cego przyczyn\u0105 problemu\n<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n        <\/div>\n\n      \n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">colorimetry<sup>2\u00a0<\/sup><\/h2>\n<p class=\"post__paragraph\">Although observation with the unaided eye plays an important role in assessing the condition of lubricants and reacting quickly to unfavorable phenomena, instrumental methods allow the evaluation of oil color in a\u00a0much more precise manner.<\/p>\n<p class=\"post__paragraph\">The ASTM D1500 standard method used is suitable for a\u00a0wide range of petroleum products: lubricating oils, heating oils or liquid fuels. It is based on a\u00a0hue scale from 0.5 (brightest) to 8 (darkest). It involves acting with a\u00a0standard light source on liquid samples placed in a\u00a0determination container and then comparing with a\u00a0standard.<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"tiles  gallery alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <div class=\"offset-lg-2 col-lg-5\">\n\n        \n        \n        \n          <p class=\"desc\">Changes in the oil color of the wind turbine&#8217;s main gearbox during operation of the device:<\/p>\n\n        \n      <\/div>\n\n      \n        <div class=\"offset-lg-2 col-lg-9 tiles__items\">\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/art_probka_1.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"art_probka_1\" data-description=\"65000h; barwa wg ASTM 1,1\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/art_probka_1.jpg\" class=\"tiles__image\" alt=\"65000h; barwa wg ASTM 1,1\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>65000h; barwa wg ASTM 1,1<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/art_probka_2.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"art_probka_2\" data-description=\"74000h; barwa wg ASTM 1,7\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/art_probka_2.jpg\" class=\"tiles__image\" alt=\"74000h; barwa wg ASTM 1,7\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>74000h; barwa wg ASTM 1,7<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/art_probka_3.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"art_probka_3\" data-description=\"87000h; barwa wg ASTM 3,2\">\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/art_probka_3.jpg\" class=\"tiles__image\" alt=\"87000h; barwa wg ASTM 3,2\" loading=\"lazy\">\n\n\t\t            \t\t\t            <figcaption>87000h; barwa wg ASTM 3,2<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n            <a href=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/probka4.jpg\" class=\"tiles__image-wrapper glightbox\" data-title=\"probka4\" data-description=\">90000h; barwa wg ASTM >8&#8243;>\n\n\t            <figure>\n\t\t            <img decoding=\"async\" src=\"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/probka4.jpg\" class=\"tiles__image\" alt=\">90000h; barwa wg ASTM >8&#8243; loading=&#8221;lazy&#8221;>\n\n\t\t            \t\t\t            <figcaption>>90000h; barwa wg ASTM >8<\/figcaption>\n\t\t            \n\t            <\/figure>\n            <\/a>\n\n          \n        <\/div>\n\n      \n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"editor alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n      <article class=\"offset-lg-2 col-xl-9 col-lg-10 editor__text\">\n\n        \n          \n            \n\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t      \n\t\t\t\t\t\t      \t\t\t\t\t\t\t      <div class=\"post\">\n\t\t\t\t\t\t\t\t      <h2 class=\"post__header heading heading--line\">summary<\/h2>\n<p class=\"post__paragraph\">Oil color is a\u00a0parameter whose determination helps effectively diagnose the condition of petroleum products, but it is not a\u00a0comprehensive test.<\/p>\n<p class=\"post__paragraph\">When alarming symptoms are found, it is advisable to do more extensive research to identify the problem.<\/p>\n<p>[1] Norbert Becker, Akira Sasaki, Erik Becker, \u201eVarnish-Problems and Colorimetric Analysis\u201d<br>\n[2] ASTM D1500 -12 (Reapproved 2017) Standard Test Method for ASTM Color of Petroleum Products<\/p>\n\n\t\t\t\t\t\t\t      <\/div>\n\t\t\t\t\t\t      \t\t\t\t\t      <\/div>\n                \n          \n        \n      <\/article>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<section class=\"contact alignwide\">\n  <div class=\"container\">\n    <div class=\"row\">\n\n      <div class=\"offset-lg-2 offset-md-0 col-lg-6 contact__text\">\n\n        \n          <h2 class=\"heading heading--line\"><a id=\"kontakt\">contact<\/a><\/h2>\n\n        \n        \n          <h3 class=\"heading heading--large\">do you have questions about the services?<\/h3>\n\n        \n        \n          <p class=\"desc\">Contact us &#8211;&nbsp;call or send us a&nbsp;message:<\/p>\n\n        \n      <\/div>\n\n      \n        <div class=\"offset-lg-2 offset-md-0 col-lg-9 tiles__items\">\n\n          \n            <div class=\"tiles__item\">\n              <h4 class=\"tiles__heading heading\">Ecol Sp. z&nbsp;o.o.<\/h4>\n\n              <ul class=\"contact-details\">\n\n                \n                  <li class=\"contact-details__item\"><a href=\"https:\/\/g.page\/r\/CTBn48MobweNEBA\" target=\"_blank\">Podmiejska 71A, 44-207 Rybnik<\/a><\/li>\n\n                \n                \n                  <li class=\"contact-details__item\"><a href=\"tel:+48327391830\" class=\"contact-details__link\">T: +48 32 739 18 30<\/a><\/li>\n\n                \n                \n                  <li class=\"contact-details__item\"><a href=\"tel:+48327391829\" class=\"contact-details__link\">F: +48 32 739 18 29<\/a><\/li>\n\n                \n                \n                  <li class=\"contact-details__item\"><a href=\"mailto:ecol@ecol.eu\" class=\"contact-details__link\">ecol@ecol.eu<\/a><\/li>\n\n                \n              <\/ul>\n            <\/div>\n\n          \n          \n        <\/div>\n\n      \n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<div style=\"height:2px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n","protected":false},"excerpt":{"rendered":"Regular oil analysis, is one way to prevent fleet failures. In an effort to share knowledge, we are publishing another pill of information on lubricant diagnostics.","protected":false},"author":3,"featured_media":11031,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[64,61,65],"tags":[],"class_list":["post-16686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-conventional-energy","category-diagnostic-services","category-renewable-energy"],"acf":[],"image":"https:\/\/ecol.eu\/wp-content\/uploads\/2023\/01\/probki-min.jpg","_links":{"self":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts\/16686","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/comments?post=16686"}],"version-history":[{"count":19,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts\/16686\/revisions"}],"predecessor-version":[{"id":24381,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/posts\/16686\/revisions\/24381"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/media\/11031"}],"wp:attachment":[{"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/media?parent=16686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/categories?post=16686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ecol.eu\/en\/wp-json\/wp\/v2\/tags?post=16686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}