Properly oiling a dirt bike air filter is critical for preventing dirt from entering your engine. A foam air filter must be evenly saturated with purpose-built oil to trap dust while maintaining airflow.

If your filter is worn or due for replacement, browse options here: Shop Dirt Bike Air Filters & Accessories.

Why Air Filter Oil Is Necessary

Foam filters rely on tacky oil to capture dirt particles. Without oil, fine dust can pass through the foam and cause internal engine wear.

What You'll Need

  • Clean, completely dry foam air filter
  • Foam air filter oil (spray or liquid)
  • Gloves
  • Clean towels

Use only foam-specific oil designed for off-road riding. Browse available options here: Shop Air Filter Oil.

Before You Oil: Make Sure It's Clean

Never oil a dirty filter. If your filter hasn't been properly cleaned, follow this guide first: How to Clean a Dirt Bike Air Filter.

Step 1: Apply the Oil

Using Spray Oil

  1. Spray evenly across the entire surface.
  2. Rotate to ensure full coverage inside and out.
  3. Massage oil into the foam.

Using Liquid Oil

  1. Pour a small amount onto the filter.
  2. Massage thoroughly to ensure complete saturation.
  3. Work oil evenly into all foam pores.

Step 2: Remove Excess Oil

  • Squeeze (do not wring) the filter.
  • Blot lightly with a towel if necessary.
  • Allow oil to tack up for 15-30 minutes.

The filter should look evenly coated and slightly tacky, not dripping.

Step 3: Reinstall the Filter

  1. Apply sealing grease around the rim.
  2. Mount securely to the cage.
  3. Ensure proper seating inside the airbox.

Proper sealing prevents dirt from bypassing the filter.

How Often Should You Oil Your Filter?

  • Dusty riding: After every ride
  • Wet/muddy conditions: After every ride
  • Moderate conditions: Every 1-3 rides

Everything You Need to Oil Your Air Filter