AUTOOL AS503 Engine Oil Tester

AUTOOL AS503 Engine Oil Quality Tester – Digital Display (Petrol & Diesel)

The AUTOOL AS503 Engine Oil Tester is a professional oil analysis tool designed for automotive inspection, servicing, and preventative maintenance. It accurately measures the transparency (transmittance) of engine oil in both petrol and diesel engines, helping identify contamination, impurities, and oil degradation.

By analysing oil condition in real time, the AS503 allows technicians and vehicle owners to make informed oil change decisions, preventing premature engine wear, breakdowns, and costly repairs ensuring your engine runs smoothly and efficiently.

Key Features

Optical Precision Oil Testing

Using advanced optical testing principles, the AS503 evaluates engine oil quality by measuring oil transparency. The clearer the oil, the better its condition, providing a fast, reliable assessment without laboratory testing.

The 2.8-inch high-definition backlit LCD screen displays results clearly in both bright daylight and low-light workshop environments.

Intelligent Sound & Visual Alerts

The AS503 provides clear oil change guidance based on transmittance levels:

• 100% – 60%: Oil condition is good – no change required

• 60% – 30%: Warning symbol displayed – oil change recommended

• Below 30%: Audible beep alarm alerts you to change oil immediately

The display also shows real-time oil temperature (T) during testing.

Built-in Oil Temperature Measurement

An integrated temperature sensor measures and displays actual oil temperature, ensuring accurate readings within the normal operating temperature range and providing insight into engine load and condition.

Wide Oil Compatibility

Compatible with most petrol and diesel engine oils available on the market. Separate testing modes for petrol and diesel engines ensure more precise oil condition analysis.

High-Precision Optical Probe

Equipped with a high-precision optoelectronic sensor, delivering fast response times and highly accurate measurement results.

Flexible 800mm Hose Probe

The 800mm flexible probe easily bends to reach oil ports and dipstick tubes. Made from PTFE material, it offers:

• Excellent oil resistance

• Strong oxidation resistance

• Outstanding corrosion resistance

• Long service life

Ideal for quick, convenient testing in tight engine bays.

Ergonomic & Durable Design

The handheld body features a silicone-lined grip for comfortable, secure single-handed operation. Lightweight and durable, it’s built for daily workshop use.

Simple Operation

1. Wipe the probe clean

2. Remove the oil dipstick

3. Select engine type using the ↶ button

4. Insert the probe into the engine oil

5. Press ► to start the test

6. View oil quality and temperature results instantly

Why Buy From Premium Diagnostic Equipment?

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