Uni Filter entered the air filtration industry in 1969 with a simple concept "Lets design an air filter that works.". And that's exactly what we did. And the rest is history. Uni Filter products perform their best in the worst of conditions.
The instructions for soaking the filter in oil were a bit confusing. I couldn't understand if both sponge elements should be soaked, perhaps a picture with the filter. Otherwise will test it and it appears well-made and good quality.