--- product_id: 585925504 title: "AS503 Engine Oil Quality Tester for Gasoline and Diesel Engines" brand: "qpking" price: "R1512" currency: ZAR in_stock: true category: "Qpking" url: https://www.desertcart.co.za/products/585925504-as503-engine-oil-quality-tester-for-gasoline-and-diesel-engines store_origin: ZA region: South Africa --- # Optical transmittance measurement 31.5-inch flexible PTFE probe Real-time oil temperature display AS503 Engine Oil Quality Tester for Gasoline and Diesel Engines **Brand:** qpking **Price:** R1512 **Availability:** ✅ In Stock ## Summary > 🚗 Keep your engine in the fast lane with precision oil insights! ## Quick Answers - **What is this?** AS503 Engine Oil Quality Tester for Gasoline and Diesel Engines by qpking - **How much does it cost?** R1512 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/585925504-as503-engine-oil-quality-tester-for-gasoline-and-diesel-engines) ## 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 - • **Extended Reach Probe:** 800mm flexible PTFE probe accesses hard-to-reach dipstick tubes without hassle. - • **Dual Fuel Compatibility:** Seamlessly switch between gasoline and diesel modes for versatile engine testing. - • **User-Friendly Interface:** 2.8-inch backlit LCD delivers clear readings and intuitive workflow for efficient maintenance. - • **Smart Maintenance Insight:** Combine readings with your vehicle’s specs to optimize oil change intervals and avoid costly engine wear. - • **Precision Optical Screening:** Quickly assess engine oil clarity and condition with advanced transmittance technology. ## Overview The QPKING AS503 Engine Oil Quality Tester offers a cutting-edge optical transmittance screening combined with real-time oil temperature monitoring. Designed for both gasoline and diesel engines, its 31.5-inch flexible PTFE probe ensures easy access to challenging dipstick tubes. Featuring a bright 2.8-inch backlit LCD, this tester empowers professionals to make informed maintenance decisions quickly, enhancing engine longevity and performance. ## Description Buy QPKING AS503 Engine Oil Quality Tester for Gasoline and Diesel Engines | Optical transmittance screening with oil temperature display, 31.5-inch PTFE probe and 2.8-inch backlit LCD: Automotive - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - Optical Oil Condition Screening: Measures engine oil transmittance and displays oil temperature to provide a quick maintenance reference for gasoline and diesel engines. Use the reading together with the vehicle maker's oil specification, mileage, service interval, and operating conditions. - Gasoline And Diesel Modes: Select the correct engine type before testing. Designed for gasoline and diesel engine lubricating oil only. It is not intended for transmission fluid, brake fluid, power steering fluid, hydraulic fluid, fuel, or household oils. - 31.5-Inch Flexible PTFE Probe: The 800 mm probe reaches many narrow or angled dipstick tubes without disassembly. If the sensor tip cannot be fully immersed, or the vehicle has no usable dipstick access, extract a small oil sample into a clean container before testing. - Clear Display And Repeatable Workflow: The 2.8-inch backlit LCD shows transmittance, oil temperature, selected gasoline or diesel mode, battery level, and status indicators. Clean the probe, select the correct mode, fully immerse the sensor tip, start the test, and wipe the probe after use. - Know The Testing Limits: The AS503 is an optical screening tool, not a laboratory oil-analysis system. It is not designed to report laboratory measurements such as viscosity, TBN, wear metals, fuel dilution, coolant contamination, or exact remaining oil life. Oils containing molybdenum disulfide, organic molybdenum, graphene, or similar additives may affect optical readings. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CG99ZLX7 | | Brand | QPKING | | Customer Reviews | 4.3 4.3 out of 5 stars (132) | | Date First Available | August 22, 2023 | | Item Weight | 13.1 ounces | | Item model number | AS503 engine oil tester | | Manufacturer | QPKING | | Manufacturer Part Number | AS503 Motoröl-Qualitätsprüfgerät | | Model | oil quality tester | | Package Dimensions | 10.04 x 5.59 x 2.32 inches | ## Images ![AS503 Engine Oil Quality Tester for Gasoline and Diesel Engines - Image 1](https://m.media-amazon.com/images/I/61J2FHUeZsL.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 - 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.co.za/products/585925504-as503-engine-oil-quality-tester-for-gasoline-and-diesel-engines](https://www.desertcart.co.za/products/585925504-as503-engine-oil-quality-tester-for-gasoline-and-diesel-engines) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-09-20*