Testing the Dilution Rate of Gasoline in Engine Oil in Accordance with ASTM D7593

Introduction

If gasoline or diesel mixes into engine oil, it decreases the oil viscosity and prevents the oil from achieving its proper performance as a lubricating oil. Measuring the fuel dilution rate serves as a key indicator during oil replacement, because it can determine the degradation status of engine oil. The test methods used to measure the fuel dilution rate are specified in standards such as U.S. ASTM standards D3524, D3525, and D7593. ASTM D7593 governs gasoline, diesel, and biodiesel. This article describes an example of using an ASTM D7593-compliant backflush system to quickly analyze the dilution rate of gasoline in engine oil.

June 25, 2023 GMT