VdiagTool OT100 Engine Oil Tester VdiagTool OT100 engine oil tester provides a reference for judging whether the engine oil is still usable or needs to be replaced. It is mainly used for detecting the quality of the engine oil, so as to ensure that the engine oil is workable and drives safely. ✅Advantages of OT100 Engine Oil Tester 1. LCD will tell you the test result. 2. Long probe designed for Motor vehicles,no need to take oil outside. ✅Instructions and precautions for use Instructions:1. Open the hood and find the dipstick2. Press the power button to turn on the turbine oil detector.3. Pull out the engine dipstick and put the probe into the dipstick hole4. Click the button switches to turbine oil detection status5. Wait for 10 seconds for to show the test results,click the the button to clear the measurement results Notice: 1.Water Content Indicator For Check Oil Quality Detector,OT100 ,can only test the engine oil added to gasoline vehicles and cannot test the engine oil added to diesel vehicles;2.Normal test range: 30%-100%;3.If the oil is lower than 30%, the engine oil should be changed;4.new engine oil shows 100%;5.Before testing, make sure the engine temperature must be below 60 degrees to avoid burning out the probe;6.The probe must be kept clean;7.When testing, make sure the probe does not touch the bottom of the engine to avoid a 500% situation;8.Keep the battery with sufficient power. ✅Measurement Results Explanation 1. below 30%, high water content, it is recommended to replace the engine oil.2. between 30%-80%, your car engine oil content some water, but still able to work.3. above 80%, your engine oil is in good condition.