Cut open the 2 under bed filters on my Cummins Ram today. I had 9,300 miles and 2 years on them.
I changed the underwood filter as well. It had 19,250 miles on it and 3-1/2 years.
Just my $0.02
I changed the underwood filter as well. It had 19,250 miles on it and 3-1/2 years.
Just my $0.02