Check the cabin air filter youself, if

回答: Camshaft end cap old and oil leak123*3212011-08-20 07:44:05

you feel it is too dirty, then change it. I change the cabin filters from every 6,000 miles to 12,000 miles. All despends the actual condition of the filter. Some cars have much larger filters compared with some other cars. In that case, they can last longer.

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