AUTOOL AS503 Engine Oil Quality Tester
The AUTOOL AS503 Engine Oil Quality Tester is a professional diagnostic tool designed for workshops, technicians, and vehicle owners who want a fast and accurate way to assess engine oil condition. Using advanced optical sensing technology, the AS503 measures oil transmittance to detect contamination, impurities, and oil degradation in both petrol and diesel engines.
By providing clear numerical results and practical recommendations, the AS503 helps prevent engine damage caused by poor oil quality and supports timely oil changes to extend engine life.
How It Works
The AS503 uses an optical sensor to analyse the light transmittance of engine oil. Changes in transparency indicate contamination, metal particles, or oil ageing. A high-precision processing chip analyses the data and displays clear results on the HD screen, along with easy-to-understand recommendations such as:
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Continue using
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Recommend replacing
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Immediate oil change
This allows quick, confident maintenance decisions without guesswork.
Key Features & Benefits
High-Precision Oil Analysis
Advanced optical sensing and digital analysis provide accurate oil quality detection, far more reliable than traditional visual inspection.
Petrol & Diesel Compatibility
Dual testing modes support both gasoline and diesel engines, making it suitable for a wide range of vehicles.
Fast & Easy Testing
Test results are displayed in seconds on a bright 2.8-inch LCD backlit screen, clearly visible in all lighting conditions.
Oil Temperature Measurement
Built-in temperature sensor measures real-time oil temperature, improving accuracy and providing insight into engine operating conditions.
Portable & Durable Design
Compact and lightweight for workshop or mobile use. The flexible 800mm PTFE probe hose offers excellent resistance to oil, oxidation, and corrosion for long-term durability.
Extend Engine Life
Early detection of oil degradation helps prevent excessive wear, engine failure, and costly repairs.
Specifications
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Model: AS503
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Operating Voltage: 6V (4 × 1.5V batteries)
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Operating Temperature: -10°C to 60°C
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Display: 2.8-inch HD LCD backlit screen
Important Notes
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Designed to test oil light transmittance and detect metallic impurities
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Recommended testing interval: every 5,000–10,000 km
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Not currently supported for Suzuki J20A engines
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Do not force the probe hose if resistance is encountered
Why Choose AUTOOL AS503?
The AS503 is developed through AUTOOL’s independent R&D and meets international certification standards (CE, FCC, ROHS). It offers professional-level oil condition analysis in a simple, reliable, and efficient tool—ideal for workshops and serious vehicle owners who want to protect engine performance and longevity.
