[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-1-en-105":3,"doc-seo-571323-105":53,"doc-detail-571323-en":127},{"code":4,"msg":5,"data":6},0,"success",[7,14,19,24,29,34,39,44,49],{"id":8,"doc_module":9,"doc_module_name":10,"category_name":11,"show_sort_weight":12,"slug":13},11,1,"Template","Presentations",90,"presentations",{"id":15,"doc_module":9,"doc_module_name":10,"category_name":16,"show_sort_weight":17,"slug":18},12,"Resumes",80,"resumes",{"id":20,"doc_module":9,"doc_module_name":10,"category_name":21,"show_sort_weight":22,"slug":23},14,"Invoices",70,"invoices",{"id":25,"doc_module":9,"doc_module_name":10,"category_name":26,"show_sort_weight":27,"slug":28},15,"Posters",60,"posters",{"id":30,"doc_module":9,"doc_module_name":10,"category_name":31,"show_sort_weight":32,"slug":33},16,"Social Media",50,"social-media",{"id":35,"doc_module":9,"doc_module_name":10,"category_name":36,"show_sort_weight":37,"slug":38},17,"Forms",40,"forms",{"id":40,"doc_module":9,"doc_module_name":10,"category_name":41,"show_sort_weight":42,"slug":43},18,"Letters",30,"letters",{"id":45,"doc_module":9,"doc_module_name":10,"category_name":46,"show_sort_weight":47,"slug":48},21,"Paper Templates",5,"papers-templates",{"id":50,"doc_module":9,"doc_module_name":10,"category_name":51,"show_sort_weight":4,"slug":52},158,"General","general-158",{"code":4,"msg":54,"data":55},"ok",{"site_id":56,"language":57,"slug":58,"title":59,"keywords":60,"description":61,"schema_data":62,"social_meta":120,"head_meta":122,"extra_data":124,"updated_unix":126},105,"en","sae-viscosity-understanding-viscosity-grades-for-engine-oils","SAE Viscosity - Understanding Viscosity Grades for Engine Oils","","SAE Viscosity explains how the Society of Automotive Engineers (SAE) classification defines oil viscosity and thickness across operating temperatures and starting conditions. It covers grade naming, including the “W” cold/startup requirement, multigrade behavior at low temperature and at 100°C, and testing concepts such as HT/HS viscosity for engine protection and KRL testing for gear oils. The guide also introduces viscosity units (cP, cSt) and discusses permanent versus temporary shear and lubrication modes that affect wear prevention.",{"@graph":63,"@context":119},[64,80,102],{"@type":65,"itemListElement":66},"BreadcrumbList",[67,71,74,77],{"item":68,"name":69,"@type":70,"position":9},"https://docshare.wps.com","Home","ListItem",{"item":72,"name":10,"@type":70,"position":73},"https://docshare.wps.com/template/",2,{"item":75,"name":51,"@type":70,"position":76},"https://docshare.wps.com/template/general/",3,{"item":78,"name":59,"@type":70,"position":79},"https://docshare.wps.com/template/sae-viscosity-understanding-viscosity-grades-for-engine-oils/571323/",4,{"url":78,"name":59,"@type":81,"image":82,"author":87,"headline":59,"publisher":90,"fileFormat":93,"inLanguage":57,"description":61,"dateModified":94,"datePublished":95,"encodingFormat":93,"isAccessibleForFree":96,"interactionStatistic":97},"DigitalDocument",{"url":83,"@type":84,"width":85,"height":86},"https://docshare.wps.com/thumbnails/sae-viscosity-understanding-viscosity-grades-for-engine-oils/571323.png","ImageObject",442,249,{"name":88,"@type":89},"LangkahRina","Person",{"url":68,"name":91,"@type":92},"DocShare","Organization","application/pdf","2026-10-23","2026-10-13",true,{"@type":98,"interactionType":99,"userInteractionCount":101},"InteractionCounter",{"@type":100},"ViewAction",8,{"@type":103,"mainEntity":104},"FAQPage",[105,111,115],{"name":106,"@type":107,"acceptedAnswer":108},"What does “SAE” mean in SAE viscosity classifications?","Question",{"text":109,"@type":110},"“SAE” stands for Society of Automotive Engineers. SAE created a system to classify oil viscosity or thickness for different grades and operating temperatures.","Answer",{"name":112,"@type":107,"acceptedAnswer":113},"How should the “W” numbers in an oil grade be understood?",{"text":114,"@type":110},"The first number before “W” relates to cold/startup viscosity and pumpability at low temperatures. The second number reflects oil thickness at operating temperature (100°C), with higher numbers thinning less as the oil heats up.",{"name":116,"@type":107,"acceptedAnswer":117},"What is HT/HS viscosity and why is it important?",{"text":118,"@type":110},"HT/HS (High Temperature/High Shear) simulates high-stress engine areas such as bearings and cams. It measures viscosity and indicates oil film thickness under severe conditions, helping ensure adequate protection against wear.","https://schema.org",{"og:url":78,"og:type":121,"og:title":59,"og:site_name":91,"og:description":61},"article",{"robots":123,"canonical":78},"index,follow",{"doc_id":125,"site_id":56},571323,1792083180,{"code":4,"msg":5,"data":128},{"doc_id":125,"user_id":129,"nickname":88,"user_avatar":130,"doc_module":9,"category_id":50,"category_name":51,"doc_title":59,"doc_description":61,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":101,"is_deleted":4,"is_public":9,"is_downloadable":9,"audit_status":9,"page_count":47,"language":136,"language_code":57,"site_id":56,"html_lang":57,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":61,"update_tm":140,"read_time":73},962090893776,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","SAE Viscosity  \nWhat is an SAE Viscosity?  \nLast updated: 23/08/2018 5:23 pm  \nSAE stands for Society of Automotive Engineers. The SAE developed a classification system to define the viscosity or thickness of oil. This system has been progressively modified over the years. It defines “operating temperature”engine oil viscosities for different grades and contains specifications for “cranking” viscosity and pumpability at startup, the “W” grades or winter. A multigrade oil is one that meets both a “W” low temperature viscosity requirement and a 100°C “operating temperature” requirement.  \nFor engine oils there is a specification that must be met at 150°C , known as a High Temperature/High Shear (HT/HS) viscosity. HT/HS simulates what happens in high stress areas of the engine e.g. bearings, cams, etc. It measures the viscosity and indicates the oil film thickness under severe high-speed conditions. An oil that is too thin under these conditions may not provide the required protection to prevent significant wear in these critical engine parts.  \nIn addition, gear oils require a KRL test. This is a severe  \noil shear test, and the oil must stay in grade or within a nominated range after shear. Its severity is the mainreason why 75W-x gear oils are expensive as these are  \ndifficult to make.  \nCentipoise (cP) and Centistokes (cSt) are the units viscosity is measured in.  \nThe following chart shows a comparison of different viscosity grades versus temperature range  \nUnderstanding Viscosities  \nThe number in front of the “W” signifies the viscosity of the oil at cold/start up temperature (tested at -10 to -35°C depending on the grade. Please refer to the SAE J300 - Engine Oils Chart opposite) . The lower the first number, the faster the oil flows (pumpability) when the engine is cold.  \nThe second number represents the oil’s thickness at operating temperature (100°C) . All oils thin out as they get hotter.  \nSo, the higher the second number, the less the oil will thin out as it heats up, compared to an oil with a lower second number.  \nNormally, multigrade viscosities are measured on a curve.  \nPENRITE OIL COMPANY PTY LTD ABN 25 005 001 525 110 Greens Rd, Dandenong South, Victoria 3175 Australia Phone: 1300-PENRITE (1300 736 748)  \nFax: 1800-PENRITE (1800 736 748)  \nInternational Ph: +61 3 9801 0877 , Fax: +61 3 9801 0977 New Zealand Ph:0800 533 698 , Fax: 0508 736 748  \n[Website: www.penriteoil.com.au](Website: www.penriteoil.com.au)  \nEmail: [penrite@penriteoil.com](penrite@penriteoil.com)  \nIn the example above, all three oils have the same operating temperature vicosity but different cold temperature viscosities.  \nAll three will be similar viscosities when at operating temperature, measured at 100°C  \nIn the example below, all 4 oils jave the same cold temperature viscosity, but different operating temperature viscosities  \nThe next graph shows the differences between three different multigrade oils  \nPENRITE OIL COMPANY PTY LTD ABN 25 005 001 525 110 Greens Rd, Dandenong South, Victoria 3175 Australia Phone: 1300-PENRITE (1300 736 748)  \nFax: 1800-PENRITE (1800 736 748)  \nInternational Ph: +61 3 9801 0877 , Fax: +61 3 9801 0977 New Zealand Ph:0800 533 698 , Fax: 0508 736 748  \n[Website: www.penriteoil.com.au](Website: www.penriteoil.com.au)  \nEmail: [penrite@penriteoil.com](penrite@penriteoil.com)  \nThe Society of Automotive Engineers (SAE) set parameters for multigrade oils and viscosities base upon cold cranking viscosity, pumpability and cST measured at operating temperature. The table below shows these requirements.  \nPermanent Vs Temporary Shear  \nThe below diagrams show the two types of shear that can occur with viscosity index improvers (VII) . Permanent Shear is defined as the physical breaking apart of the polymer (VI Improver) into smaller pieces and hence the oil suffers from a permanent loss of viscosity. Temporary Shear occurs when the polymer is squashed but does not break apart and hence “springs back” to its original siz","cbCaiaoEchYU3RQq","https://ap.wps.com/l/cbCaiaoEchYU3RQq","pdf",1017336,"English","# SAE Viscosity\n## What is an SAE Viscosity?\n## Understanding Viscosities\n## High Temperature/High Shear (HT/HS) and KRL Testing\n## Permanent Vs Temporary Shear\n## Hydrodynamic and Boundary Lubrication","[{\"question\":\"What does “SAE” mean in SAE viscosity classifications?\",\"answer\":\"“SAE” stands for Society of Automotive Engineers. SAE created a system to classify oil viscosity or thickness for different grades and operating temperatures.\"},{\"question\":\"How should the “W” numbers in an oil grade be understood?\",\"answer\":\"The first number before “W” relates to cold/startup viscosity and pumpability at low temperatures. The second number reflects oil thickness at operating temperature (100°C), with higher numbers thinning less as the oil heats up.\"},{\"question\":\"What is HT/HS viscosity and why is it important?\",\"answer\":\"HT/HS (High Temperature/High Shear) simulates high-stress engine areas such as bearings and cams. It measures viscosity and indicates oil film thickness under severe conditions, helping ensure adequate protection against wear.\"}]","SAE Viscosity - Understanding Viscosity Grades for Engine Oils | PDF",1791912591]