quote:
If both of these quotes are correct, then 99% to 99.9% efficiency is not sufficient and we need better filters.
and again I ask, based on what data ?
Aren't we delving into the realm of diminishing returns ?
OTR truck engines routinely last 1,000,000km if serviced correctly. Doug Hillary has posted the results of one of his DD 60 series engines pulled down @ 1,000,000km by MTU/Detroit in Australia, and all tolerances were within new spec.
OK, this isn't a car, yet the air filter uses exactly the same technology that is used in almost any car.
How long do you need an engine to last ? How many people
need their cars to last 1,000,000km ? What about the rest of the driveline and body/chassis ?
Are engines wearing out prematurely due to poor air filtration ?
I'm sorry, but IMHO, just because a testing lab makes a (logical) statement that contaminants entering through the intake system wears out engines doesn't automatically correlate with "....we need better filters". I'd suggest that sloppy maintenance, poor practice when changing the filter, poor filter/air box sealing, etc, would introduce more contaminants of a size that contribute to wear over a vehicles lifetime than pass through an OEM spec air filter element.