Clean air filter

[LJ2]

After 30,000 miles, my air filter is not dirty;
Why?
1994 940 volvo; non turbo

 

[Lars Trebing]

After 30,000 miles, my air filter is not dirty; Why?

Probably because you don't drive around in cities where the air is full
of smoke and dust.

 

[Brick_0]

After 30,000 miles, my air filter is not dirty;
Why?

If air is always being drawn from the pre-heat hose it would be cleaner than
if it were drawn from the front of the car. There's a flap in the air intake
system that switches to outside air after the car warms up; check that.

Brick_0