Operating method for a filter system (100, in particular of a motor vehicle , wherein the filter system comprises the following: - a filter element for a fluid filter , wherein the filter element is made available in a package with first data about the filter element , and wherein the filter element features a radio-frequency identification means (110; 110a-110d) with second data about the filter element , - a filter housing of the fluid filter , in which the filter element can be replaceably disposed, and which features a reading device for the radio-frequency identification means (110; 110a-110d), - an evaluation unit as well as a memory unit , with the steps: a) Inserting the filter element into the filter housing and reading in the first data from the package of the filter element into the memory unit , b) Reading out the second data of the radio-frequency identification means (110; 110a-110d) with the reading device , c) Comparing the first and second data in the evaluation unit , and issuing a warning and/or preventing an operation of the fluid filter if the comparison has shown that the second data of the radio-frequency identification means (110; 110a-110d) and the first data of the package do not match as predetermined. wherein the filter system comprises the following: - a filter element for a fluid filter , wherein the filter element is made available in a package with first data about the filter element , and wherein the filter element features a radio-frequency identification means (110; 110a-110d) with second data about the filter element , - a filter housing of the fluid filter , in which the filter element can be replaceably disposed, and which features a reading device for the radio-frequency identification means (110; 110a-110d), - an evaluation unit as well as a memory unit , - a filter element for a fluid filter , wherein the filter element is made available in a package with first data about the filter element , and wherein the filter element features a radio-frequency identification means (110; 110a-110d) with second data about the filter element , - a filter housing of the fluid filter , in which the filter element can be replaceably disposed, and which features a reading device for the radio-frequency identification means (110; 110a-110d), - an evaluation unit as well as a memory unit , with the steps: a) Inserting the filter element into the filter housing and reading in the first data from the package of the filter element into the memory unit , b) Reading out the second data of the radio-frequency identification means (110; 110a-110d) with the reading device , c) Comparing the first and second data in the evaluation unit , and issuing a warning and/or preventing an operation of the fluid filter if the comparison has shown that the second data of the radio-frequency identification means (110; 110a-110d) and the first data of the package do not match as predetermined. a) Inserting the filter element into the filter housing and reading in the first data from the package of the filter element into the memory unit , b) Reading out the second data of the radio-frequency identification means (110; 110a-110d) with the reading device , c) Comparing the first and second data in the evaluation unit , and issuing a warning and/or preventing an operation of the fluid filter if the comparison has shown that the second data of the radio-frequency identification means (110; 110a-110d) and the first data of the package do not match as predetermined. <EOS>