I just pull mine out at random and check it. If it looks good, I tap it on the fence to knock some dust out and put it back in. If it has some crap in it, I run the shop vac over it, knock the dust out on the fence and put it back.
I also run everything on recirc. That probably helps cut down on outside debri.
The $12 filter I put in there almost 2 years ago, still looks like it's a week old.
And I've probably spent a whole 4 min of my life, maintaining it.
You can get the OEM for around $15, or an aftermarket for less than $5 shipped.
I use the aftermarket, and blow it out with an air compressor between changes.
I usually blow it out and reset the service light while waiting for the oil to drain.
I Would pull it out and look at it at least every few 1000 miles. But, you can't go by a timeline or mileage. How often to check it all depends on how often the system is running, how dusty your area is, if there's a ton of bugs, trees, pollen, etc. in your area.
And then it's discretion. Does it just have light dust and can be blown or vac'd out and reused? Is it packed solid and needs to be replaced?
TundraTalk.net forum offers the most comprehensive collection of Toyota Tundra information. Find discussions on the Toyota Tundra Diesel, TRD Pro, SR5, lift kits, towing capacity, classifieds, and more!