[Christ]

If you want a cleanable filter that doesn't gum up MAF sensors, and has no potential issues with diesel engines, get one from AEM or Fram. They're cotton gauze material, washable, and don't require oil.

K&N filters aren't any more environmentally responsible, either. You're using soap which contains phosphates to wash out the dirt/grime/oil that is going down the drain into the public water supply, making it even more difficult to provide clean water, or further poisoning your local water table in the event that you're using a well.

Farmers out here will tell you that one drop of oil will contaminate 1,000,000 gallons of water. It's not to a harmful level, but the point is to be very aware of what you're doing.

Wash that filter out, and you're doing just as much harm as you would be by throwing that paper filter into the landfill. Where's the logic?

There's a reason that K&N doesn't make these claims on their own... they rely on fanboys to make the claims for them.