Most of my OPE has a air filter with a foam pre-filter element that goes around or on top of it. This includes my Echo trimmer, two Kohler Command V-twins, Briggs 900-series on my tiller, and a couple others.
In the past I have always squeezed some oil into the filter (usually using MMO or something light viscosity that spreads evenly) before installing it. But I've also noticed that when doing this, the pre-filters get gummed up with crap quickly, I can't even get a mowing season out of them before having to replace or clean the pre-filter. Hard to clean all the gunk out and for the price they usually just get replaced.
Is there any benefit to oiling the pre-filter, or should I just let it be? What do you guys do?
In the past I have always squeezed some oil into the filter (usually using MMO or something light viscosity that spreads evenly) before installing it. But I've also noticed that when doing this, the pre-filters get gummed up with crap quickly, I can't even get a mowing season out of them before having to replace or clean the pre-filter. Hard to clean all the gunk out and for the price they usually just get replaced.
Is there any benefit to oiling the pre-filter, or should I just let it be? What do you guys do?