Walker Air Seps

They sell a kit of cleaner and oil. About $20 at most auto stores. Made and sold by airsep.
Remove filter, laundry sink with hot water works best. Spray filter with cleaner, let stand a few minutes, rinse out with hot water. Take outside and air-dry. Then spray with oil till you have a nice evening red color.

I think they do 2 different kits, one with red oil, one blue. You'll have to check which oil was used previously.

Really shouldn't have to. Remember rinse from inside to the outside. All the crud is on the outside

Thanks, that's actually what I was referring to.

Just installed new Walker Seps, do I need to oil new filters before use?

If they're not oiled then yes.

thnx for the replies, checked their website under frequently asked questions. They come ready to use out of the box, only need to re-oil after cleaning

And only lightly oiled. Remember this is not a lubricant but an assist to reduce the filtration diameters, plus add a little adhesiveness to the air flow. The base oil is a thick mineral oil.

How can you tell when it's time to clean or replace?