Product Description
CUMMINS 3959009 OEM ENGINE OIL DIPSTICK – RAM 5.9L (2003–2007)
If you’ve lost, bent, or broken the factory oil stick on your 5.9L Cummins, the Cummins 3959009 engine oil dipstick is the correct genuine OEM replacement for 2003–2007 Ram 2500/3500 trucks equipped with the 5.9L ISB common-rail diesel. This flat-blade dipstick (approx. 44.5" overall length) is calibrated to the OE oil pan and tube so your oil level readings stay accurate and repeatable, just like the day the truck rolled off the lot.
Unlike generic “will-fit” sticks that can read high or low, this Cummins-built 3959009 dipstick uses the correct handle, blade profile, and marked full/add range for your 24-valve ISB. Pair it with the matching Cummins 3957070 dipstick tube to restore the entire oil level system on your 5.9L and protect that investment one quick check at a time.
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Key Features
- Genuine Cummins 3959009: OE service replacement dipstick – not an aftermarket copy.
- Correct 44.5" flat-blade design: Matches factory length and blade profile for accurate readings.
- Calibrated for 5.9L ISB CR: Designed around the 2003–2007 Ram 2500/3500 5.9L common-rail oil pan and tube.
- Durable construction: Factory-style handle and hardened blade resist heat, vibration, and corrosion.
- Drop-in installation: Slides into the OE tube and snaps into the factory retainer points.
Verified Fitment
Automotive Applications (Pickup)
- 2003–2007 Dodge Ram 2500/3500 – 5.9L Cummins ISB, 24-valve common-rail diesel
Notes:
- Intended for trucks originally equipped with the 5.9L ISB common-rail engine (early 2007 only – 2007.5+ 6.7L uses different components).
- For industrial / B-series applications, always confirm by engine serial number (ESN) and OEM documentation.
Cross-Reference & Related Cummins Components (On CPP Diesel)
Build a complete, leak-free OEM oiling system by pairing the 3959009 dipstick with other genuine Cummins hardware from CPP Diesel:
- Cummins 3957070 Engine Oil Dipstick Tube – OEM for Ram 5.9L ISB (2003–2007)
- Cummins 3949769 Engine Oil Pan – OEM for Ram 5.9L (2003–2007)
- Cummins 3949692 Engine Oil Pickup Tube – OEM Oil Suction Connection for Ram 5.9L ISB (2003–2007)
- Cummins 3959031 Engine Oil Cooler – OEM Core for Ram 5.9L ISB (2003–2007)
Sister Cummins Dipsticks (Other Year Ranges)
- Cummins 3937748 Engine Oil Dipstick – OEM for Ram 5.9L (2001–2002)
- Cummins 3928740 Engine Oil Dipstick – OEM for 5.9L 12V (1994–1995)
These sister part numbers are shown for model-year reference only — always confirm your exact application by VIN/ESN and OE service information.
What’s Included
- (1) Genuine Cummins Engine Oil Dipstick – Part #3959009
Dipstick tube, oil pan, pickup tube, oil cooler, and related hardware sold separately.
Installation & Usage Tips
- Route the 3959009 dipstick through the factory tube (most commonly Cummins 3957070 on 2003–2007 5.9L Rams).
- Make sure the handle seats fully in the top of the tube before checking level.
- Check oil with the truck on level ground and engine at normal operating temperature per OE procedure.
- If readings seem inconsistent, inspect the tube, O-ring/grommet, and oil pan for damage or non-OE components.
Specifications for cummins 3959009
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3959009 |
| Description | Engine oil level dipstick, flat-blade style |
| Overall Length / Style | Approx. 44.5" flat-blade (factory-style) |
| Primary Application | Engine oil level measurement – 5.9L ISB common-rail Cummins |
| Engine Compatibility | 2003–2007 Dodge Ram 2500/3500 5.9L ISB (24V, common-rail); select B-series / ISB industrial (verify by ESN) |
| Cross Reference | Service part 3959009 – see related Cummins dipsticks 3937748 (’01–’02 5.9L) and 3928740 (’94–’95 5.9L 12V) for other year ranges |
| UPC | Not specified by Cummins (many catalogs list “Does Not Apply” for this OEM service part) |
| GTIN | Not specified |
| Warranty | Typical Cummins replacement part warranty (time/mileage limits per Cummins policy) |
| Shipping Weight | Approx. 1.0 lb (packaged) |
| Shipping Dimensions | Approx. 1.0" W x 1.0" H x 47.0" L (packaged) |
| Shipping Method | Standard ground; shipping calculated at checkout |
| E-Codes / Emissions | Service component – does not change emissions configuration |
| Prop 65 Warning | This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov. |
Frequently Asked Questions
WILL THIS DIPSTICK FIT MY 2003–2007 5.9L CUMMINS RAM?
Yes. Cummins 3959009 is the OE engine oil dipstick for most 2003–2007 Ram 2500/3500 trucks equipped with the 5.9L ISB common-rail diesel. Always verify fitment by VIN and/or engine serial number if your engine or pan has been swapped.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This is a genuine Cummins OEM part sourced through CPP Diesel – not a generic or “will-fit” replacement.
WHAT IS THE LENGTH AND STYLE OF THE 3959009 DIPSTICK?
This dipstick is a flat-blade design with an overall length of roughly 44.5", matching factory specifications for 2003–2007 5.9L ISB Ram trucks.
DOES THIS COME WITH THE DIPSTICK TUBE?
No. This listing is for the dipstick only. The most common matching tube on 2003–2007 5.9L Rams is Cummins 3957070, sold separately.
WILL 3959009 WORK ON 6.7L CUMMINS APPLICATIONS?
No. 6.7L Cummins engines (2007.5+ Ram and later) use different dipstick and tube part numbers. Use this 3959009 dipstick only on supported 5.9L ISB applications and confirm by VIN/ESN when in doubt.
DOES THIS PART HAVE A PROP 65 WARNING?
Yes. Like many OEM service components, it carries a California Proposition 65 warning regarding potential exposure to chemicals that may cause cancer or reproductive harm. See the Prop 65 section above for details.
