Air Filters

[Rip3z]

Should the old air filter be full of scum and muck?

Just went to replace my old one and it's not very dirty.

Should I replace it every certain period of time regardless of how dirty it is?

 

[Woodentop]

i think they should be changed every service.

 

[Rip3z]

I am servicing myself, I found the answer anyway - every 12,000 miles.