---
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: "¥13940"
currency: JPY
in_stock: true
category: "Qpking"
url: https://www.desertcart.jp/products/728308379-engine-oil-quality-tester-as503-engine-oil-tester-for-gasoline
store_origin: JP
region: Japan
---

# 2.8" HD LCD screen for crystal-clear readings High-precision optical probe for accurate oil quality detection Integrated oil temperature sensor for real-time engine status 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:** ¥13940
**Availability:** ✅ In Stock

## Summary

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

## 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?** ¥13940 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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

- • **Grip & Go:** Ergonomic silicone-covered handheld design for comfortable, one-handed operation during busy maintenance routines.
- • **See Every Detail:** Large 2.8-inch backlit LCD ensures you never miss critical oil quality data, day or night.
- • **Peace of Mind Warranty:** 3-year damage protection plus lifetime maintenance support keeps your investment secure and reliable.
- • **Precision Meets Versatility:** Compatible with gasoline & diesel engines across multiple lubricant standards for flawless diagnostics.
- • **Flexible Testing, Effortless Handling:** 31.5-inch PTFE hose probe offers corrosion resistance and easy access to hard-to-reach engine parts.

## Overview

The AS503 Engine Oil Quality Tester by QPKING is a professional-grade diagnostic tool designed for both gasoline and diesel vehicles. Featuring a high-precision optical probe, a 2.8-inch backlit LCD screen, and an integrated oil temperature sensor, it delivers accurate, real-time assessments of lubricant condition. Its flexible, corrosion-resistant PTFE hose and ergonomic handheld design make testing convenient and reliable. Backed by a 3-year warranty and lifetime maintenance, this tester is essential for proactive engine care and maintenance.

## 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

## 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 | #626,485 in Automotive ( See Top 100 in Automotive ) #3,357 in Oil System Tools |
| Brand | QPKING |
| Customer Reviews | 4.3 4.3 out of 5 stars (119) |
| 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.

## Frequently Bought Together

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-07-11*