Is this easy to use for someone who's not a mechanic?

Absolutely! It's designed for everyone.Just wipe the probe, select your engine type(gasoline or diesel), dip it in the oil, and press the button.You'll get a clear "OK" or "Replace" result on the large screen in seconds—no technical knowledge needed.

How accurate is it compared to just looking at the oil color?

More accurate than the human eye, our optical sensor analyzes microscopic oil contaminants to give definitive percentage and temperature readings—eliminating maintenance guesswork.

Does it work on both old and new cars, and for diesel trucks?

Yes! It is universally compatible with the majority of gasoline and diesel engine oils on the market. Separate testing modes ensure accurate assessment for each engine type, whether it's your daily car, SUV, or diesel pickup truck.

Why should I buy this instead of just changing my oil regularly?

It helps you change oil smartly,not just regularly.It prevents you from changing oil too early (saving money)or too late (preventing engine damage).It's the fastest way to know if your oil is still good,optimizing both engine health and your wallet.

How do I know this is a reliable brand?

The AS503 is built with professional-grade components like a PTFE-coated probe and a robust optical sensor. It comes with a clear manual and is trusted by DIYers and professionals for its simple, dependable readings. Your satisfaction is guaranteed.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F

AS503 Engine Oil Tester - Optical Transmittance Analyzer for Gasoline & Diesel, 31.5-inch Flexible Probe, 2.8-inch Backlit LCD, Oil Temperature Gauge in °C/°F

Product ID: 585925504

🎯±0.01% optical sensor accuracy

📊2.8-inch backlit LCD real-time display

🛠️800mm flexible probe for hard-to-reach spots

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2148282₫

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Description

🔧 Don’t just change oil—know when. Stay ahead with precision testing.

PRECISION YOU CAN TRUST - Advanced optoelectronic sensor delivers lab-grade oil contamination and transmittance readings for both gasoline and diesel engines.
UNIVERSAL COMPATIBILITY - Tailored testing modes for gasoline and diesel oils guarantee accurate assessments aligned with industry standards—no guesswork needed.
ERGONOMIC FLEXIBLE DESIGN - Lightweight handheld tester with an 800mm PTFE hose and silicone grip ensures effortless single-handed operation even in tight engine compartments.
INSTANT OIL HEALTH INSIGHTS - Backlit LCD screen shows real-time oil temperature and quality status (OK/Replace) in °C or °F, empowering proactive maintenance decisions.
HASSLE FREE OPERATION SUPPORT - Three-step testing process delivers instant results, backed by a 3-year warranty and responsive customer service for lifelong peace of mind.

The AS503 Engine Oil Quality Tester is a handheld device equipped with a high-precision optical sensor and a backlit 2.8-inch LCD that measures oil transmittance and temperature in real time. Designed for both gasoline and diesel engines, it features an ergonomic grip and a flexible 800mm probe for easy access to hard-to-reach oil fill ports. With simple 3-step operation and industry-standard testing modes, it provides instant, reliable oil health status to optimize engine maintenance. Supported by a 3-year warranty and dedicated customer service, it’s a must-have tool for proactive vehicle care.

Specifications

ASIN	B0CG99ZLX7
Brand	QPKING
Customer Reviews	4.4 4.4 out of 5 stars (109)
Date First Available	August 22, 2023
Item Weight	13.1 ounces
Item model number	AS503 engine oil tester
Manufacturer	QPKING
Manufacturer Part Number	AS503 Motoröl-Qualitätsprüfgerät
Model	oil quality tester
Package Dimensions	10.04 x 5.59 x 2.32 inches

Reviews

J**N

A good mechanics tool

Works well let's you know if its time for an oil change for diesel or regular gas powered engines not to expensive easy to use

24.02.2026

E**O

Excelente

Excelente herramienta

5.02.2026

V**7

Excelente

De buena calidad y duradero

23.10.2025

O**R

Tener una forma de conocer el estado del aceite es invaluable

Me agrada la idea de tener una forma de conocer el estado real del aceite.

20.05.2025

J**A

El aparato miente

Siempre da la misma información este bueno o malo el aceite

16.04.2026

E**E

Cumple con lo requerido

Es bueno y cumplio con mis requerimientos

22.06.2025

D**L

Util

Ese artículo solo prueba la suciedad del aceite no la viscosidad

6.12.2025

E**O

Lo recomiendo

Es útil

13.07.2025

Y**A

انصح به وبشده

شكرا ً لكم

13.07.2025

M**K

Zu empfehlen

Ist gut und einfach anzuwenden und funktioniert recht gut. Man kann damit seine Motoröl Qualität überprüfen

28.10.2025

M**D

Good to know when your oil is needed to change

Works good, tried few different cars with old and new oil, shows about right. Definetely worth the the money

24.02.2026

C**N

Perfetto

Molto utile

7.04.2026

C**S

Fabuloso

Muito preciso e de excelente qualidade

5.01.2025

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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2148282₫

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In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vietnam.

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TrustScore 4.5 | 7,300+ reviews

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