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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Engine Oil Quality Tester AS503 Engine Oil Tester for Gasoline and Diesel Vehicles with 2.8" Screen, High Precision Detection Probe, Transmittance & Oil Temperature Display, Compatible with Various Lubricant Standards

Engine Oil Quality Tester AS503 Engine Oil Tester for Gasoline and Diesel Vehicles with 2.8" Screen, High Precision Detection Probe, Transmittance & Oil Temperature Display, Compatible with Various Lubricant Standards

Product ID: 728308379

📏2.8" HD LCD screen

🔬High-precision optical probe

🌡️Integrated oil temperature sensor

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2702395₫

Duties & taxes included

In stock

Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Never second-guess your engine oil again — precision testing made portable!

ERGONOMIC RELIABLE - Silicone grip handheld design for effortless one-handed operation plus 3-year warranty with lifetime support.
VERSATILE COMPATIBILITY - Works seamlessly with gasoline and diesel engines across multiple lubricant standards.
FLEXIBLE DURABLE PROBE - 31.5-inch PTFE hose resists oil and oxidation for long-lasting, convenient testing.
PRECISION AT YOUR FINGERTIPS - High-precision opto-electronic sensors deliver accurate oil quality readings every time.
SEE CLEARLY TEST CONFIDENTLY - Large 2.8-inch backlit LCD ensures crystal-clear results in any lighting condition.

The AS503 Engine Oil Quality Tester by QPKING is a professional-grade handheld device designed for both gasoline and diesel vehicles. Featuring a high-precision optical probe and a large 2.8-inch backlit LCD, it provides accurate transmittance and oil temperature readings. Its flexible 31.5-inch PTFE hose ensures easy sampling, while compatibility with various lubricant standards makes it a versatile tool for proactive engine maintenance. Backed by a 3-year warranty and lifetime support, it’s engineered for durability and ease of use.

Specifications

ASIN	B0CG99ZLX7
Amazon Bestseller	#485,577 in Automotive ( See Top 100 in Automotive ) #2,678 in Oil System Tools
Brand	QPKING
Customer Reviews	4.3 4.3 out of 5 stars (114)
Date First Available	August 22, 2023
Item Weight	372 g
Item model number	AS503 engine oil tester
Manufacturer	QPKING
Model	oil quality tester
Package Dimensions	25.5 x 14.2 x 5.89 cm; 372 g

Reviews

Y**A

شكرا ً لكم

13.07.2025

M**K

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

28.10.2025

M**D

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

24.02.2026

C**N

Molto utile

7.04.2026

C**S

Muito preciso e de excelente qualidade

5.01.2025

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