---
product_id: 728308379
title: "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"
brand: "qpking"
price: "$89.15"
currency: USD
in_stock: true
reviews_count: 5
category: "Qpking"
url: https://www.desertcart.us/products/728308379-engine-oil-quality-tester-as503-engine-oil-tester-for-gasoline
store_origin: US
region: United States of America
---

# 2.8" HD LCD screen High-precision optical probe Integrated oil temperature sensor 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

**Brand:** qpking
**Price:** $89.15
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** 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 by qpking
- **How much does it cost?** $89.15 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/728308379-engine-oil-quality-tester-as503-engine-oil-tester-for-gasoline)

## Best For

- qpking enthusiasts

## Why This Product

- Trusted qpking brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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.

## Overview

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.

## Description

desertcart.co.jp: 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 : Automotive

Review: شكرا ً لكم
Review: Ist gut und einfach anzuwenden und funktioniert recht gut. Man kann damit seine Motoröl Qualität überprüfen

## Features

- 【Compatible with Various Lubrication Standards】AS503 engine oil quality tester is suitable for most gasoline and diesel engines available on the market. Separate the sampling and measurement for gasoline and diesel engines, you can accurately evaluate the condition of lubricant
- 【Oil Temperature Display】Integrated temperature sensor to conveniently evaluate engine operating status
- High-precision optical probe: Integrates high-precision opto-electronic sensors to ensure more accurate measurement results
- Flexible Hose Probe for Convenient Testing: 31.5 inches (800 mm) long probe design provides a more flexible and convenient way to perform tests. This hose is made of PTFE material, very resistant to oil and oxidation, excellent corrosion resistance, effectively extend the life of the product
- (Easy to Use Handheld Design) The handheld part of the AS503 engine oil quality tester is covered with silicone base material, providing excellent grip and lightweight design for easy one-handed operation
- 【LARGE HIGH DEFINITION LCD】The AS503 engine oil tester is equipped with a 2.8 inch LCD screen with backlight which provides the user with clear display that can efficiently operate in any lighting condition in bright daytime or dim night
- 【3 YEAR WARRANTY & LIFETIME MAINTENANCE】We promise to resend parts free within 3 years against damage caused by human factors. If you have any need, please contact us. We will reply you as soon as possible within 24 hours

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/61J2FHUeZsL.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71HNvkH99mL.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71K4yX7kjXL.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/71azZM-mblL.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/61BjIHDeKhL.jpg)

## Questions & Answers

**Q: Is this easy to use for someone who's not a mechanic?**
A: 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.

**Q: How accurate is it compared to just looking at the oil color?**
A: More accurate than the human eye, our optical sensor analyzes microscopic oil contaminants to give definitive percentage and temperature readings—eliminating maintenance guesswork.

**Q: Does it work on both old and new cars, and for diesel trucks?**
A: 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.

**Q: Why should I buy this instead of just changing my oil regularly?**
A: 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.

**Q: How do I know this is a reliable brand?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by Y***A on July 13, 2025*

شكرا ً لكم

### ⭐⭐⭐⭐⭐ Review
*by M***K on October 28, 2025*

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

### ⭐⭐⭐⭐⭐ Review
*by M***D on February 24, 2026*

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

## Frequently Bought Together

- Engine Oil Quality Tester AS503 Engine Oil Tester for Gasoline Diesel Vehicles With 2.8"Screen High-Precision Detection Probe,Transmittance&Oil Temp.Display,Compatible With Various Lubricant Standards
- TYRAREX Automotive Transmission Fluid Tester Oil Analyzer Detector with Temperature Sensor, Gasoline & Diesel Gearbox Oil Diagnostic Tool with 31.5in Hose 2.8in Backlight Display (T20)
- Brake Fluid Tester, High Precision Car Brake Fluid Detector, Hydraulic Fluid/Liquid/Oil Moisture Analyzer with LCD Screen Audible Alarm DOT3 DOT4 DOT5.1 Tester,Automotive Replacement Level Sensors

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/728308379-engine-oil-quality-tester-as503-engine-oil-tester-for-gasoline](https://www.desertcart.us/products/728308379-engine-oil-quality-tester-as503-engine-oil-tester-for-gasoline)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-05-23*