FA-6145 High-Flow Washable Air Filter – Replaces OEM 6145-Style Air Filters
High-flow, washable air filter FA-6145
After decades working on heavy-duty diesel engines, I’ve learned that intake restriction almost never shows up as a sudden failure. It shows up as higher EGTs, lazy throttle response, excess soot, and DPF systems that regen more than they should. OEM 6145 paper filters do their job when they’re new, but once they load with dirt, restriction climbs fast.
That’s why I designed the FA-6145.
This is a high-flow, washable air filter, engineered to maintain airflow over time instead of choking the intake as miles stack up. The synthetic filter media resists collapse and airflow drop-off under sustained load, keeping the turbo operating in its efficiency range and combustion stable.
Sealing matters just as much as airflow. The FA-6145 uses OEM-matched sealing geometry so air goes through the filter — not around it. No bypass means better protection for the turbo, charge-air cooler, and engine internals.
Instead of throwing away paper filters every service interval, you wash the FA-6145, oil it correctly, reinstall it, and keep running. One filter replaces years of disposable elements, reduces downtime, and lowers long-term operating cost without sacrificing engine protection.
Compatibility Note:
If your truck or equipment calls for an OEM 6145-style air filter, the FA-6145 is a direct drop-in replacement with no modifications required.
Replaces OEM & Aftermarket Filters
| Brand / Category | Filter Part Number or Type Replaced |
|---|---|
| OEM | 6145 Air Filters |
| OEM / Aftermarket | 6145-Style Paper Filters |
| Aftermarket | Equivalent 6145-Series Intake Filters |
| Fleet / Fleetguard | 6145 Equivalent Filters |
| Baldwin | 6145 Equivalent Filters |
| Donaldson | 6145 Equivalent Filters |
| Wix / NAPA | 6145 Equivalent Filters |
Note: Replacement compatibility is based on factory 6145 dimensions and sealing geometry. Exact brand part numbers may vary by catalog.
OEM Cross-Reference Table
| OEM / Factory Part # | Application Type | Replaced By |
|---|---|---|
| 6145 | Heavy-Duty Diesel Intake | FA-6145 |
| 6145-Style Paper Filter | Class 6–8 Diesel | FA-6145 |
Features & Benefits
Features
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High-flow washable synthetic filter media
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OEM-matched sealing flange
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Designed for turbocharged diesel airflow
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Reusable, serviceable construction
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Drop-in replacement for 6145-style filters
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Built for high-mileage and fleet use
Benefits
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Maintains consistent airflow under load
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Reduces intake restriction over time
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Helps reduce forced DPF regens
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Lower exhaust gas temperatures
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Improved throttle response
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Less downtime from filter replacements
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Long-term savings vs disposable paper filters
Competitor Differentiation
Disposable paper filters are designed to be replaced, not to maintain airflow. As they load with dirt, restriction climbs and performance drops.
I built the FA-6145 to hold airflow steady over time, not just look good when it’s clean. Washable media keeps restriction lower, sealing surfaces actually seal, and the filter doesn’t become trash after one dirty service cycle.
Disposable filters keep you buying. A properly engineered washable filter keeps your engine breathing right and your operating costs under control.
Made in the USA!
*Price does not include Klotz Oil*
A set of two Fleet Air Filters
Fits:
Kenworth: T800
Peterbilt: 388
If your filter number or truck is not listed please call us at 251.654.0892!