Engine Air Filter

[larryweikart]

Thank you John for the information. My Newell usage is 95% Highway driving and to the best of my memory, I have never driven on any dirt roads. I, as well as my service center do a flashlight check on each 15000 mile service. However I don't know what you mean by a vacuum gauge unless you are referring to the gauge on the dash. I use only Doanaldson filters. With 280,00 miles on the coach I'm always concerned about potential problems.