I'm pushing 37K on a truck that I bought in July 2003. I must have the new and improved filter minder, because when the engine is running it's only sucked down about 5/16". It's never come close to the red. I checked it at 20K and it still looked new. History tells me I should change it, on general principle if nothing else, but the manual and what I read here says to let it ride until the filter minder says to change it. Anyone else getting 36,000 miles on the air filter, and if so what kind of life can we expect from it?