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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Description

🔧 Stay ahead of engine wear with precision you can trust!

CLEAR VISIBILITY ANYTIME - Large 2.8-inch backlit LCD screen guarantees easy reading in any lighting condition.
PRECISION OPTICAL SENSOR - High-accuracy optoelectronic probe ensures reliable and consistent oil quality readings.
ERGONOMIC DURABLE DESIGN - Lightweight handheld body with silicone grip and flexible PTFE hose for effortless, long-lasting use.
UNIVERSAL OIL COMPATIBILITY - Works seamlessly with most gasoline and diesel engine oils for precise diagnostics.
REAL TIME TEMPERATURE MONITORING - Integrated sensor displays oil temperature, giving instant insight into engine health.

The QPKING AS503 Engine Oil Quality Tester is a professional-grade handheld device designed for both gasoline and diesel vehicles. Featuring a high-precision optical probe, integrated oil temperature sensor, and a large 2.8-inch backlit display, it delivers accurate, real-time oil health diagnostics. Its ergonomic design with a flexible, corrosion-resistant PTFE hose ensures ease of use and durability. Backed by a 3-year warranty and responsive support, this tester empowers vehicle managers to maintain optimal engine performance and avoid costly repairs.

Specifications

ASIN	B0CG99ZLX7
Best Sellers Rank	#52,419 in Automotive ( See Top 100 in Automotive ) #6 in Automotive Oil Pressure Testers
Brand	QPKING
Customer Reviews	4.3 4.3 out of 5 stars (104)
Date First Available	22 August 2023
Item Weight	372 g
Item model number	AS503 engine oil tester
Manufacturer	QPKING
Manufacturer Part Number	AS503 Motoröl-Qualitätsprüfgerät
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**S

Muito preciso e de excelente qualidade

5.01.2025

J**N

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

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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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QPKING Engine Oil Quality Tester AS503 Engine Oil Tester for Gasoline Diesel Vehicles with 2.8-inch Backlit Screen

Description

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Common Questions