Engine oil dilution measuring method for high-pressure direct-injection gasoline engine

The invention discloses an engine oil dilution measuring method for a high-pressure direct-injection gasoline engine, which comprises the following steps of: mounting temperature sensors for respectively measuring environment temperature and engine oil temperature and cleaning an engine; repeating the cold start working condition test for multiple times, monitoring the engine oil temperature of the engine in the test process, and when the engine oil temperature reaches 40 DEG C, immediately pausing the test and immersing the vehicle; after the repeated test is finished, calculating oil dilution and viscosity change, judging whether the standard is met or not, if the standard is met, carrying out a low-speed driving working condition test, monitoring the engine oil temperature in the test process, and immediately pausing the test and immersing the vehicle when the engine oil temperature reaches 40 DEG C; performing oil drainage weighing once every 30km to calculate the increment, performing sampling, and when