I have long suspected that the only material benefit of these filters is to improve the dealers' margin on service.
Only one of our cars has such a filter and it it does about 10,000 kms per year at say at an average speed of 65kmh . That means that I spend about 150 hours a year protected by this filter and and 8,600 hours without it. That looks like a very marginal benefit unless I move into the car or put filters on the house windows.
Has anyone told the dealer to stick it and removed the filter permanently?