Which direction does a K&N filter go?

If your filter is on the ceiling, the arrow should face the ceiling. If your filter is on the wall, the arrow should face the wall.

Do you spray both sides of K&N air filter with oil?

– Apply K&N Air Filter Oil liberally to the dirty side of the filter only. This will allow for a visual reference of complete coverage.

Do K&N Filters come ready to install?

Most K&N® cotton air filters come from the factory pre-oiled and ready to install. Certain specialty and racing filters are manufactured as un-oiled filters, and will be clearly indicated as such. Synthetic air filters (such as DRYFLOW® air filters) do not utilize filter oil.

How do you know which way the air flow is to install the filter?

To properly insert a new filter, look for the arrow! The arrow on your filter should always face the unit and away from the return air duct that carries the air that will be heated or cooled. HVAC systems push the cool or warm air out and pull spent air in, recirculating the air throughout your home.

What happens if you over oil a K&N air filter?

Yes, you can over-oil a cotton/gauze type filter. Usually what happens from this is that the filter oil will foul the MAF sensor.

Will a K&N filter cause check engine light?

While uncommon, it is possible that a check engine light may come on after installing a K&N® air filter or performance intake system—but this does not necessarily mean that there is something wrong with your air filter or intake system.

Do you need to oil a new air filter?

Remember to liberally apply oil to the filter. The oil’s purpose is to prevent dirt and debris from passing through. Failing to use enough oil is counterproductive to the filter’s job. Make you’re using application specific cleaner and oil for your air filters.

Can you wash K&N filter with soap and water?

Warm soap water is a good way to use it. It’s okay to scrub it with your hand or a plastic bristle brush. 3 minutes of free flowing water under the tap in the opposite direction of the functional air flow is enough to wash it.

What happens if you install air filter backwards?

By installing your filter backwards, air will have a harder time flowing through the filter and your air handler will have to work harder to make up for the loss of airflow. This could lead to higher utility bills and possibly damage your furnace or air conditioner.