Caterpillar 6I-2509 6I2509 Engine Air Filter

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  • Product Sku: 6I-2509-1Pack
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Standard Efficiency Engine Air Filter - Primary

Contamination is your engine’s number one enemy, which is why it’s critical to protect your Cat equipment with genuine Cat Filter Elements. Cat Standard Efficiency Primary Engine Air Filters are your best value for normal duty applications, delivering increased engine protection and preventing equipment downtime.

Offering a long service life and exceptional filtration, Cat Air Filters are also environmentally friendly and cost effective. Designed to the exact specifications of your Cat equipment, genuine Cat Filters are a crucial factor in your machine’s ability to use air efficiently. A clean filter element protects internal mechanisms from being damaged by dirt.

Consistently choosing Cat Air Filters is the best choice to ensure long life and optimum performance of your Cat machinery.


  • Quick serviceability
  • Improved contamination control holds particulates during filter change


Efficiency Rating: Standard Efficiency
Primary vs Secondary: Primary
Seal Type: Radial Seal


Cold Planer
PM-465 PM-565 PM-565B

Earthmoving Compactor

Motor Grader
18M3 16 16M3 18

Wheel-Type Loader
980H 986H 988G 994F 994H

Engine - Generator Set
3406C 3408 3408B 3408C 3412 3412C C13 C27

Petroleum Products
C11 C13 C15 C18 CX31-C11I CX31-C13I CX31-C15I CX35-P800 TH35-C11I TH35-C13I TH35-C15I TH35-E81 TH48-E70 TH48-E80

Wheel Dozer
834G 854G

Underground Articulated Truck

5130 5130B 5230 5230B

Engine - Industrial
3126B 3406C 3406E 3408 3408B 3408C 3408E 3412 3412C 3412E 3456 C-15 C-16 C11 C13 C13B C15 C18 C27 C32 C9.3B

Wheel Tractor-Scraper
631G 637G 651B 657B 657E 657G

Track-Type Tractor

Road Reclaimer

* All fitment filter part numbers are based on your engine serial number.
* Please confirm with our team if you are unsure this filter will fit your engine.