Product Description
The CUMMINS 3957987 OEM CRANKCASE BREATHER FILTER is designed for 2003–2005 5.9L Cummins ISB diesel engines. This genuine Cummins crankcase ventilation filter helps control crankcase pressure, reduce oil contamination, and maintain proper engine breathing performance while delivering OEM fitment and reliability.
Use this filter during routine maintenance or when replacing a restricted, clogged, or contaminated crankcase breather element. Proper crankcase ventilation helps support engine efficiency, reduce oil leaks, and maintain long-term engine performance. Always verify fitment before ordering.
FEATURES
- Genuine Cummins OEM crankcase breather filter
- Direct-fit replacement for applicable 5.9L Cummins engines
- Helps maintain proper crankcase ventilation system operation
- Supports reduced crankcase pressure buildup
- Designed for diesel engine maintenance and service intervals
- OEM-quality fitment and filtration performance
FITMENT
- 2003–2005 Dodge Ram 2500 5.9L Cummins
- 2003–2005 Dodge Ram 3500 5.9L Cummins
- Select Cummins ISB 5.9L industrial and commercial applications
WHAT'S INCLUDED
- 1 Cummins 3957987 OEM Crankcase Breather Filter
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3957987
- Cummins Crankcase Ventilation Components
- Cummins Air Intake Service Parts
- Cummins Engine Maintenance Components
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3957987
- Part Type: Crankcase Breather Filter
- Engine Compatibility: 5.9L Cummins ISB
- Fitment Years: 2003–2005
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New OEM Cummins
- System Type: Crankcase Ventilation System
- Installation Type: Direct Replacement
FAQ
Will this filter fit my truck?
This filter is designed for 2003–2005 5.9L Cummins ISB applications listed above. Always verify your engine application and part number before ordering.
What does a crankcase breather filter do?
The crankcase breather filter helps remove oil vapor contaminants and allows proper crankcase ventilation to reduce internal pressure buildup.
Is this a genuine Cummins filter?
Yes. Cummins 3957987 is a genuine OEM Cummins crankcase breather filter designed to factory specifications.
What are the signs of a clogged crankcase breather filter?
Common symptoms may include increased crankcase pressure, oil seepage, excessive engine blow-by, and reduced ventilation system performance.
How often should the breather filter be replaced?
Replacement intervals vary by operating conditions and service schedules. Follow Cummins maintenance recommendations for your specific application.
Do I need any related parts?
Inspect breather hoses, seals, clamps, intake components, and related crankcase ventilation system parts during service and replace worn components as necessary.
