- Jan 9, 2010
- Los Gatos, CA
Change the filters.
Those look fine. Maybe vacuum and reuse. The dirt looks fairly dry, so I think a good amount can be removed using a vacuum.i'd still run them. Where I live 60k+ is fine. Now on dirt road you might need to change it every 10k
Now if you are chasing every last fractional bit of a HP a fresh one now might make sense.
Yup, this. This is the way to do it, as @Imp4 also mentioned earlier.Install a restriction gauge; change filter at 11" restriction.
On my previous Toyota that took 42K miles.
Filter change by minder at 42K milesThe WIX filter minder on my Toyota (in the sig) finally reached 11" after 6 years & 9 months. Gauge checked after a WOT run to 5000 rpm. Dirty side: Clean side: Close up: The new filter reached one click below 8" restriction.bobistheoilguy.com
Is there any real citeable source that says a dirty filter is more efficient? Or is that one of those poorly thought out ideas that people think works in theory but fails to acknoledge that a dirty filter creates less effective surface area for the air to move through which with the same flow rate means more pressure is being applied on the remaining clean spots on the filter thus causing more particles to be forced through the filter that may not have been if the filter was new.
The dirt improves filtration analogy is because it’s partially restricted… that means good fresh air also.Both filters are about 2 years old with about 20,000-25,000 miles on them. It's understood that replacing them is cheap insurance. But I also know that some dirt improves filtration. You can see that there's some sediment in between the pleats, but not that much (hopefully it's visible in the last 2 pictures). What you think, are these at the peak of the filtering capability or beyond and should be replaced?
View attachment 99612
View attachment 99613
View attachment 99614
View attachment 99615