AUTOOL AS503 · OPTICAL ENGINE OIL QUALITY & TEMP ANALYZER
AUTOOL AS503 Digital Optical Engine Oil Quality & Life Tester
Replace guesswork with data: slide the 800mm PTFE probe down the dipstick tube to quantify soot, metal wear particles, and oxidation in 2 seconds.
- Petrol & Diesel Modes
- 800mm PTFE Probe
- 2.8" LCD · 1-Year Warranty
Engineered for Professional Workshop Demands
The AUTOOL AS503 is built to deliver speed, accuracy, and durability in busy service bays.
High-Precision Optoelectronic Transmittance Sensor
Measures light transmission through the oil sample to quantify suspended soot, sludge, metal shavings, and oxidation with ±2% accuracy.
800mm PTFE (Teflon) Dipstick Probe (Ø 5.3mm)
Slides directly down the dipstick tube into the oil pan without draining oil; impervious to high temperatures and petroleum chemicals.
Selectable Petrol & Diesel Engine Modes
Dedicated algorithms account for the different soot-loading characteristics of gasoline and diesel lubricants.
3-Tier Health Grading & Audible Alarm
Displays 'OK' (100%–60%), '!' warning (60%–30%), or '×' with an audible beep (<30%) when an immediate oil change is required.
DATA-DRIVEN SERVICE ADVISING
Prove When an Oil Change Is Needed with Hard Numbers
Show vehicle owners the exact transmittance percentage and temperature on the 2.8" screen during routine inspections or pre-purchase evaluations.
- 100% – 60% Transmittance: Oil is clean and healthy (OK)
- 60% – 30% Transmittance: Contamination building (!), schedule service soon
- Below 30% Transmittance: Degraded oil (×), audible alarm signals immediate change
LIVE TEMPERATURE & DEEP REACH
-10°C to +125°C Sump Temperature Readout
An integrated thermal sensor at the probe tip measures real-time oil temperature alongside optical purity.
- 800mm probe reaches deep SUV and light-truck oil pans effortlessly
- Ergonomic anti-slip silicone grip for one-handed workshop operation
- 2.8-inch backlit LCD is easy to read in dimly lit service bays
ONE-BUTTON ZEROING & HARD CASE
Wipe Clean and Calibrate in Seconds
Simply wipe the optical slot with a paper towel and press the test button in air to verify 100% calibration before dipping.
- Powered by 4 × AAA batteries with auto power-off
- Supplied in a custom blow-molded carrying case
- Backed by a 1-year official Otoeko warranty
Detailed Visual & Technical Infographic Showcase
Close-up hardware details and application scenes of the AUTOOL AS503.
See It in Action
Watch the official product video demonstrating setup and real-world operation.
Technical Specifications & Hardware Parameters
Complete manufacturer-verified technical data and operating ranges.
| Brand / Model | AUTOOL AS503 Digital Engine Oil Tester |
|---|---|
| Measured Parameters | Optical Transmittance (%) & Oil Temperature (°C/°F) |
| Transmittance Range | 0.0% – 100.0% (±2% Accuracy) |
| Temperature Range | -10°C to +125°C (14°F to 257°F) |
| Supported Engines | Petrol (Gasoline) & Diesel Engines |
| Probe Length & Diameter | 800 mm (31.5 in) PTFE Hose · Ø 5.3 mm Tip |
| Display | 2.8-Inch Backlit Digital LCD |
|---|---|
| Alert Thresholds | 100–60% (OK) · 60–30% (!) · <30% (× + Buzzer) |
| Response Time | ~2 Seconds |
| Power Supply | 4 × 1.5V AAA Batteries (Auto Shut-Off) |
| Kit Weight | ~1.1 kg (Including Hard Carrying Case) |
| Warranty | 1 Year Official Otoeko Warranty |
Workshop Application & Operating Guide
Recommended 4-step standard operating procedure for accurate results.
Check Engine Temp & Wipe Tip
Ensure engine oil temperature is below 60°C for safe testing; wipe the optical probe slot clean with tissue.
Select Engine Type
Power on the AS503 and select Petrol or Diesel mode according to the vehicle.
Insert via Dipstick Tube
Pull the dipstick and feed the 800mm PTFE probe down the tube until submerged in sump oil.
Read % & Temperature
Press the test button to read exact transmittance %, oil temperature, and OK / ! / × status in 2 seconds.
Conventional Methods vs. Professional Diagnostics
How precision engineering eliminates guesswork and comebacks.
Conventional / Basic Methods
- Visual dipstick checks cannot quantify microscopic soot or oxidation
- Cup-style testers require draining oil or using messy suction pumps
- Lacks real-time oil temperature measurement
- Single-mode testers misjudge diesel vs. petrol soot levels
With AUTOOL AS503
- Quantifies optical transmittance from 0% to 100% with ±2% accuracy
- 800mm PTFE probe tests directly inside the dipstick tube in 2 seconds
- Displays live oil temperature (-10°C to +125°C) simultaneously
- Separate Petrol and Diesel modes plus a protective hard case
Package Contents — Ready for the Workshop
Complete factory kit inspected prior to dispatch.
- 1 × AUTOOL AS503 Digital Optical Engine Oil Tester (800mm Probe)
- 1 × Custom Blow-Molded Hard Carrying Case
- 1 × User Manual (Uses 4×AAA Batteries)
1 Year Official Otoeko Warranty
The AUTOOL AS503 is backed by a 1 Year official Otoeko warranty against manufacturing defects, with full technical support.
Frequently Asked Questions
Key technical questions from technicians and workshops about the AUTOOL AS503.
Do I need to drain oil to test it?
No! Simply pull out the engine dipstick and slide the 5.3mm × 800mm PTFE probe down the dipstick tube.
Does it work on both petrol and diesel engines?
Yes, it features dedicated Petrol and Diesel modes on the control panel.
What is the difference between AS503 and AS505?
AS503 is calibrated for engine oils (petrol & diesel), whereas AS505 is specifically calibrated for automatic transmission fluids (ATF).
Can I test boiling-hot engine oil immediately after driving?
Wait until the engine oil cools below 60°C (140°F) before inserting the optical probe for accurate readings and sensor longevity.
What do the percentage results mean?
100%–60% indicates good oil (OK); 60%–30% indicates moderate contamination (!); below 30% triggers an audible alarm (×) recommending an immediate oil change.
What is the warranty period?
It includes a 1-year official Otoeko warranty.