GB/T 8243.13-2015 is part 13 of the series of standards for testing methods for full-flow oil filters for internal combustion engines. This part specifies the test equipment, sample preparation, test procedures, etc. for the static pressure resistance test of composite filters. The pressure performance of the filter is evaluated by applying static pressure to the composite filter and determining the maximum pressure it can withstand. This standard provides a unified specification for mass testing and performance evaluation of composite filters, which helps to ensure the Reliability and safety of internal combustion engine oil filters during operation.