Kenworth W900 12.7 Glider.

Might look into a Fleet Air filter. Will get you better air flow and thy are reusable.

 

I have a 379 Pete and change them once a year, but they never really look that bad.

 

Yes it has two 15” breathers.

 

Once a year, prefer to change in spring after road salt and chemical season is over.

 

I used to change the paper filters every 3-4 months. I have Fleet Air filters now and I only wash them 2 or 3 times a year and even right before I washing them I can hardly get the restriction gauge to move when I'm drawing enough air to make 60+ pounds of boost.

I also had trouble finding the oil at first so when I did find a place that sold it, I just bought a case. I literally have enough to last me 10 years for an investment of a little over $100

 

Once a year . Twin air cleaners on a westernstar. Every other oil change sounds really excessive for a hwy tractor.

 

Once a year, unless off road work with dusty conditions. Have found they stay much cleaner than the smaller under the hood filters. Your miles may amount to more than what i do.