{"id":3549,"date":"2026-09-29T05:43:50","date_gmt":"2026-09-29T05:43:50","guid":{"rendered":"https:\/\/shop.autoboss.com\/?post_type=product&#038;p=3549"},"modified":"2026-10-09T08:20:31","modified_gmt":"2026-10-09T08:20:31","slug":"autool-as503-engine-oil-tester-with-digital-display","status":"publish","type":"product","link":"https:\/\/autoboss.com\/es\/product\/autool-as503-engine-oil-tester-with-digital-display\/","title":{"rendered":"AUTOOL AS503 Engine Oil Quality Tester for Gasoline &#038; Diesel Engines"},"content":{"rendered":"<div class=\"abd-pd\" data-abd-version=\"1\">\n<header class=\"abd-hero\">\n<h3>Screen Gasoline and Diesel Engine Oil by Transmittance and Temperature<\/h3>\n<p class=\"abd-lead\">The AS503 dips an optical probe into engine oil, reads how much light passes through it and shows the result with the current oil temperature, in separate gasoline and diesel modes. Not suitable for oils with molybdenum or graphene additives.<\/p>\n<ul class=\"abd-facts\">\n<li>Gasoline + Diesel Modes<\/li>\n<li>800 mm PTFE Probe<\/li>\n<li>Transmittance + Temperature<\/li>\n<li>Sound Alarm<\/li>\n<li>2.8-Inch Backlit LCD<\/li>\n<\/ul>\n<\/header>\n<section class=\"abd-sec\" id=\"abd-features\">\n<h4>Key Features<\/h4>\n<ol class=\"abd-features\">\n<li>\n<h5>Optical Oil Probe<\/h5>\n<p>An integrated photoelectric transceiver sensor reads transmittance, which drops with contamination and suspended particles.<\/p>\n<\/li>\n<li>\n<h5>Flexible PTFE Hose<\/h5>\n<p>Makes sampling easier around the engine bay and resists oil, oxidation and corrosion.<\/p>\n<\/li>\n<li>\n<h5>Gasoline and Diesel Modes<\/h5>\n<p>Select the engine type before testing to match the lubricant standard.<\/p>\n<\/li>\n<li>\n<h5>Oil Temperature Readout<\/h5>\n<p>A built-in sensor shows the actual oil temperature, switchable between \u00b0C and \u00b0F.<\/p>\n<\/li>\n<li>\n<h5>Clear Screen and Alerts<\/h5>\n<p>Battery level, engine type, transmittance, temperature and result symbols on one screen, with a beep when replacement is suggested.<\/p>\n<\/li>\n<li>\n<h5>One-Hand Grip<\/h5>\n<p>A silicone grip supports single-handed checks.<\/p>\n<\/li>\n<\/ol>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-box\">\n<h4>What&#8217;s in the Box<\/h4>\n<ul class=\"abd-box\">\n<li>AS503 engine oil quality tester with integrated 800 mm PTFE probe<\/li>\n<li>User manual<\/li>\n<li>Retail box<\/li>\n<\/ul>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-use\">\n<h4>How to Use<\/h4>\n<ol class=\"abd-steps\">\n<li><b>Wipe the probe<\/b><span>Clean the test probe to reduce residue interference.<\/span><\/li>\n<li><b>Open the test point<\/b><span>Remove the dipstick or access the oil test point per the vehicle service requirements.<\/span><\/li>\n<li><b>Select the engine type<\/b><span>Choose gasoline or diesel mode with the selection button.<\/span><\/li>\n<li><b>Submerge the probe<\/b><span>Place the probe in the oil with the sensing area fully immersed.<\/span><\/li>\n<li><b>Start the test<\/b><span>Press the test button and let the reading complete.<\/span><\/li>\n<li><b>Read the result<\/b><span>Check transmittance, result symbol and oil temperature on the display.<\/span><\/li>\n<\/ol>\n<p class=\"abd-note\">Modes, results and cleaning: <a href=\"https:\/\/autoboss.com\/wp-content\/uploads\/autool-catalog\/media\/8accd36db682766661520aca.pdf\" target=\"_blank\" rel=\"noopener\">AS503 user manual (PDF)<\/a>.<\/p>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-notes\">\n<h4>Good to Know<\/h4>\n<div class=\"abd-notes\">\n<div class=\"abd-note-group is-caution\">\n<h5><span class=\"abd-tag\">Caution<\/span><\/h5>\n<ul>\n<li>Not suitable for engine oils containing molybdenum disulfide (MoS\u2082), organic molybdenum, graphene or similar additives.<\/li>\n<li>The Suzuki J20A engine is not supported.<\/li>\n<li>For engine oil only; it is not a brake, transmission or power steering fluid tester.<\/li>\n<li>Batteries are not confirmed as included; prepare four 1.5 V batteries.<\/li>\n<li>If the hose or probe jams, do not force it out; stop and check its position.<\/li>\n<\/ul>\n<\/div>\n<div class=\"abd-note-group is-care\">\n<h5><span class=\"abd-tag\">Care<\/span><\/h5>\n<ul>\n<li>Clean the probe before each test and use a clean, representative sample.<\/li>\n<li>A check every 5,000\u201310,000 km is a practical reference, depending on oil type, driving conditions and maintenance schedule.<\/li>\n<li>The result is a screening reference, not laboratory analysis of viscosity, wear metals or remaining service life.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/section>\n<section class=\"abd-sec\" id=\"abd-faq\">\n<h4>FAQ<\/h4>\n<details class=\"abd-faq\" name=\"abd-faq\">\n<summary>Which AUTOOL tester do I need for other fluids?<\/summary>\n<p>AS501 and AS502 test brake fluid water content, AS505 transmission fluid transmittance, AS506 brake fluid boiling point and AS507 power steering fluid transmittance.<\/p>\n<\/details>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<ul>\n<li><strong>Optical Engine-Oil Screening:<\/strong> Measure engine-oil transmittance to screen for contamination and suspended particles that reduce transparency.<\/li>\n<li><strong>Gasoline + Diesel Oil Modes:<\/strong> Choose separate gasoline or diesel engine-oil modes for the intended lubricant check.<\/li>\n<li><strong>800 mm PTFE Probe:<\/strong> Reach oil around the engine bay with the flexible, oil-resistant hose probe.<\/li>\n<li><strong>Oil Temperature Display:<\/strong> View current oil temperature in \u00b0C or \u00b0F alongside the screening result.<\/li>\n<li><strong>Status + Sound Prompts:<\/strong> Use screen symbols and sound reminders to distinguish acceptable, attention, and replacement guidance.<\/li>\n<\/ul>","protected":false},"featured_media":12436,"comment_status":"open","ping_status":"closed","template":"","meta":{"_gspb_post_css":""},"product_brand":[128],"product_cat":[62,99],"product_tag":[135,136],"class_list":["post-3549","product","type-product","status-publish","has-post-thumbnail","product_brand-autool","product_cat-best-selling-products","product_cat-fluid-testers","product_tag-engine-oil-analyzer","product_tag-engine-oil-tester","first","instock","sale","shipping-taxable","purchasable","product-type-variable"],"_links":{"self":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product\/3549","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/comments?post=3549"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/media\/12436"}],"wp:attachment":[{"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/media?parent=3549"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product_brand?post=3549"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product_cat?post=3549"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/autoboss.com\/es\/wp-json\/wp\/v2\/product_tag?post=3549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}