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I just bought a Termi exhaust kit for my 1098. It comes with a washable air filter to replace the factory. TYPICALLY, washable filters are oiled prior to install, but I know it isn't always so. So who oils, who doesn't?
 

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35,000km so far on oiled air filters
 

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not to threadjack, but what is the purpose of the oil anyway? always wanted to know that.
 

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Trackday Junkie
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I don't. The filter gets most of the stuff anyway. But what I do, however, is change the motor oil often. Every 1500 miles or so. All my bikes run tip top.

MOST of the time, people over oil the filter way way too much. If you do oil it, it's a very light spray/coating. Lots of oil is much more restrictive than a stock filter, and a lot of oil/dirty filter is really restrictive.
 

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Old Wizard
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Oil the Stock Filters

Foam air filters are a reasonable balance between good airflow, dust holding capacity, and filtration efficiency for small particles.

But, you should oil a foam filter to trap small dirt particles. Otherwise they pass right through.

It's a good idea to use dirt retention oil on the stock foam filters. When you wet open cell polyurethane foam with this specially developed sticky oil, the sticky oil is suspended in the path of the dirty air on the strands of the web-like cell structure of the foam. This makes it difficult for small dirt particles to pass through the depth of the filter without sticking to the strands. Of course, larger particles are trapped if they are bigger than the distance between the cell strands themselves.

As the outer wetted strands become loaded with dirt particles and no longer sticky, the wetted strands deeper into the foam continue trapping dirt, until the entire foam thickness is utilized. Further, as dirt particles build up on the strands, the space between strands decreases, further increasing the filter efficiency by trapping even smaller dirt particles that initially could pass between the strands in a clean filter.

When the filter is sufficiently dirty to stop trapping small particles and clogging reduces airflow, it can conveniently be carefully washed, re-oiled, and re-used. When oiling a foam air filter, use as little as possible, but do get adequate coverage. Use care when you disassemble the plastic filter frame.
 
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