{"id":40201,"date":"2023-11-27T13:50:13","date_gmt":"2023-11-27T05:50:13","guid":{"rendered":"https:\/\/shop.autooltech.com\/?post_type=product&p=40201"},"modified":"2026-05-20T03:11:52","modified_gmt":"2026-05-20T11:11:52","slug":"autool-as503-engine-oil-tester","status":"publish","type":"product","link":"https:\/\/autoolstore.com\/da\/product\/autool-as503-engine-oil-tester\/","title":{"rendered":"AUTOOL AS503 Engine Oil Tester with Digital Display"},"content":{"rendered":"
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AUTOOL AS503<\/div>\n

Product Overview<\/h2>\n

The AUTOOL AS503 is a handheld engine oil tester for gasoline and diesel vehicles. It uses optical probe technology to check engine oil transmittance and oil temperature, helping users evaluate oil contamination, oil quality, and replacement timing during automotive inspection and maintenance.<\/p>\n

\n Engine Oil Transmittance<\/span>\n Gasoline \/ Diesel Modes<\/span>\n Oil Temperature Display<\/span>\n 10s Response<\/span>\n <\/div>\n
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2.8-inch<\/span>Backlit LCD<\/span><\/div>\n
800mm<\/span>PTFE Probe Hose<\/span><\/div>\n
6V<\/span>4 \u00d7 1.5V Batteries<\/span><\/div>\n
3 Years<\/span>Warranty Support<\/span><\/div>\n <\/div>\n <\/div>\n
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\n \"AUTOOL\n \n Click to enlarge<\/span>\n <\/figure>\n
\n \"AUTOOL\n \n Click to enlarge<\/span>\n <\/figure>\n <\/div>\n <\/div>\n <\/section>\n\n
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Before You Order And Use<\/div>\n

Before You Order And Use<\/h2>\n

AS503 is designed for engine lubricating oil quality checks based on light transmission. Review the oil type limitation, engine limitation, test interval, and probe handling notes before ordering or using the tester.<\/p>\n <\/div>\n

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Engine Oil Only<\/h3>\n

AS503 is intended for gasoline and diesel engine lubricating oil. It is not a brake fluid, transmission fluid, or power steering fluid tester.<\/p>\n <\/article>\n

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Optical Detection Limit<\/h3>\n

Because AS503 uses an optical detection probe, it is not suitable for engine oils containing molybdenum disulfide (MoS\u2082), organic molybdenum, graphene, or similar additives.<\/p>\n <\/article>\n

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Suzuki J20A Not Supported<\/h3>\n

AS503 does not support Suzuki J20A engine testing for the time being. Contact support before ordering if you need confirmation for this engine.<\/p>\n <\/article>\n

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Recommended Check Interval<\/h3>\n

Use AS503 as a reference check every 5,000-10,000 km, depending on engine condition, oil type, driving environment, and maintenance schedule.<\/p>\n <\/article>\n <\/div>\n

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Probe Handling Reminder<\/h3>\n