---
product_id: 585925504
title: "AS503 Professional Engine Oil Tester for Gasoline & Diesel – Oil Condition Monitor with Temperature Sensor & 31.5” Flexible Probe, Handheld Analyzer with 2.8” LCD, Oil Change Indicator Tool"
brand: "qpking"
price: "378 Lei"
currency: RON
in_stock: true
reviews_count: 13
category: "Qpking"
url: https://www.desertcart.ro/products/585925504-as503-professional-engine-oil-tester-for-gasoline-and-diesel-oil
store_origin: RO
region: Romania
---

# 31.5” flexible PTFE probe 60-sec oil degradation test Real-time oil temperature sensor AS503 Professional Engine Oil Tester for Gasoline & Diesel – Oil Condition Monitor with Temperature Sensor & 31.5” Flexible Probe, Handheld Analyzer with 2.8” LCD, Oil Change Indicator Tool

**Brand:** qpking
**Price:** 378 Lei
**Availability:** ✅ In Stock

## Summary

> 🔧 Diagnose like a pro, change oil like a boss.

## Quick Answers

- **What is this?** AS503 Professional Engine Oil Tester for Gasoline & Diesel – Oil Condition Monitor with Temperature Sensor & 31.5” Flexible Probe, Handheld Analyzer with 2.8” LCD, Oil Change Indicator Tool by qpking
- **How much does it cost?** 378 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/585925504-as503-professional-engine-oil-tester-for-gasoline-and-diesel-oil)

## 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

- • **Engine Bay Ninja:** Ultra-flexible 31.5” probe reaches the tightest spots without mess or hassle.
- • **Dual-Mode Mastery:** Tailored testing for both Gasoline & Diesel engines ensures spot-on recommendations.
- • **Pro-Grade Durability:** Silicone grip, backlit 2.8” LCD, and extreme temp operation built for serious users.
- • **Precision in a Minute:** Get lab-grade oil health results in just 60 seconds—no more guesswork.
- • **Peace of Mind Warranty:** 3 years free parts replacement + lifetime support keeps you covered.

## Overview

The AS503 Professional Engine Oil Tester is a handheld analyzer designed for both gasoline and diesel engines, delivering precise oil degradation and temperature readings within 60 seconds. Featuring a 31.5” flexible, oil-resistant probe, a clear 2.8” backlit LCD, and dual-mode operation, it empowers professionals and DIYers to make informed oil change decisions with lab-grade accuracy. Built tough for extreme conditions and backed by a 3-year warranty, it’s the ultimate tool for proactive engine maintenance.

## Description

Buy AS503 Professional Engine Oil Tester for Gasoline & Diesel – Oil Condition Monitor with Temperature Sensor & 31.5” Flexible Probe, Handheld Analyzer with 2.8” LCD, Oil Change Indicator Tool: Automotive - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: De buena calidad y duradero
Review: Excelente artículo - Excelente

## Features

- 👍 【Stop Guessing When to Change Oil】 The AS503 gives you a science-based answer in 60 seconds by measuring both oil degradation (Transmittance %) and real-time temperature. Its separate modes for Gasoline & Diesel engines provide a precise “Good/Fair/Change” recommendation on the clear 2.8″ screen.
- 👍 【Reach Every Engine with the 31.5″ Super-Long, Flexible Probe】 Made of oil-resistant PTFE, this 800mm hose probe snakes into the tightest engine bays, allowing direct testing through the oil fill cap without messy oil extraction on most vehicles.
- 👍 【Monitor Two Critical Engine Health Indicators】 Beyond just oil life, track real-time oil temperature to uncover potential cooling system issues. The high-precision optical sensor ensures lab-grade accuracy for consistent, reliable results every time.
- 👍【Built for Pros & Serious DIYers】Features a silicone-grip handheld design, a large backlit LCD with intuitive analog bar graph display, and operates in extreme temperatures (-10°C~60°C). A complete, ready-to-use kit for garage or fleet use.
- 👍【 Important Note for Full Transparency】This optical tester may not be accurate for oils containing Molybdenum Disulfide or Graphene additives. For all conventional and synthetic oils, it’s your trusted advisor. We include clear cautions and full support.
- 👍【Three Years Warranty And Lifelong Maintenance】For the damage caused by non-human factors, we promises to resend the parts for free within 3 years. For any demand, we warmly welcome you to contact us, and we will reply you as soon as possible within 24 hours.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CG99ZLX7 |
| Brand | QPKING |
| Customer Reviews | 4.4 4.4 out of 5 stars (88) |
| Date First Available | August 22, 2023 |
| Item Weight | 13.1 ounces |
| Manufacturer | QPKING |
| Manufacturer Part Number | AS503 Motoröl-Qualitätsprüfgerät |
| Package Dimensions | 10.04 x 5.59 x 2.32 inches |

## Images

![AS503 Professional Engine Oil Tester for Gasoline & Diesel – Oil Condition Monitor with Temperature Sensor & 31.5” Flexible Probe, Handheld Analyzer with 2.8” LCD, Oil Change Indicator Tool - Image 1](https://m.media-amazon.com/images/I/61J2FHUeZsL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by V***7 on October 23, 2025*

De buena calidad y duradero

### ⭐⭐⭐⭐⭐ Excelente artículo
*by L***. on July 14, 2025*

Excelente

### ⭐⭐⭐⭐⭐ Review
*by E***E on June 22, 2025*

Es bueno y cumplio con mis requerimientos

## 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
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**Shop now:** [https://www.desertcart.ro/products/585925504-as503-professional-engine-oil-tester-for-gasoline-and-diesel-oil](https://www.desertcart.ro/products/585925504-as503-professional-engine-oil-tester-for-gasoline-and-diesel-oil)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-31*