How often should these filters be changed?

[jbach36]

Someone previously said the interval change for the fuel filter was in the manual, but I didn't see it anywhere. I think it's supposed to be changed every 12,000 miles? I know the smaller pre-filters get changed on a visual basis, whenever they get dirty.

Also the air filter. A local place said unless you're driving on dusty back roads, which we're not, here in metro Atlanta, once every 30,000 miles should be fine. I don't think he was far off the mark, as a visual inspection shows the filter still looking practically new, and I think it's 3 years old with probably 30k on it.

Thanks,

jeff 1991 300d, 157k