Pipercross panel filter servicing/cleaning?

For anyone searching Pipercross I used one from nearly new on my 59 plate Saab, its still fitted now, my son-in-law has the car. gets cleaned and LIGHTLY oiled every 2 years. 

I fitted on to my Octavia at 8 months old, its coming up to 5 years old - no issues. They do work but don't over oil.