Product Description
CUMMINS 3905799 OEM OIL GAUGE TUBE (DIPSTICK TUBE) – RAM 5.9L (1989–1998)
The genuine CUMMINS 3905799 OEM oil gauge tube is the factory-correct dipstick tube used on 1989–1998 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L 12-valve Cummins. A damaged, cracked, or loose dipstick tube can lead to inaccurate oil readings or even oil mist leakage in the engine bay. This OE-formed steel tube restores the original routing and secure dipstick seating to ensure accurate oil level checks on your 6BT.
Many older 12-valve engines suffer from rusted or broken dipstick tubes due to heat cycling, vibration, and age. Using a genuine Cummins replacement guarantees proper fitment to the engine block and oil pan rail, and prevents blow-by vapors from escaping around the dipstick. Pairing this tube with the correct OEM dipstick ensures reliable, repeatable oil level readings.
Key Features
- Genuine Cummins OEM dipstick tube for exact fitment.
- Factory-formed steel construction maintains proper routing and sealing.
- Restores accurate oil level readings on all 5.9L 12-valve engines.
- Prevents oil mist leaks and blow-by seepage from worn or cracked tubes.
- Direct-fit replacement for 1989–1998 5.9L Cummins engines.
Fitment Details
- Engine: 5.9L Cummins 12-Valve (6BT)
- Years: 1989–1998
- Vehicle Applications: Dodge Ram 2500 / 3500, industrial 6BT variants
- Notes: Always verify using your engine serial number (ESN).
Cross-Reference & Companion Cummins Parts
CPP Diesel stocks the matching components to complete a full dipstick system refresh:
- CUMMINS 3925016 OEM DIPSTICK – 5.9L
- CUMMINS 3906698 FRONT OIL SEAL
- CUMMINS 3931536 FRONT COVER GASKET
- VIEW MORE GENUINE CUMMINS PARTS
Common cross-reference numbers: 3905799, 3905800 (verify by VIN/ESN).
Installation Notes
- Ensure the tube is fully seated in the engine block to prevent oil vapor leaks.
- Inspect the dipstick O-ring for wear before reinstallation.
- A light coat of oil can assist insertion into the block grommet.
- Verify dipstick travel after installation.
Specifications for cummins 3905799
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3905799 |
| Alternate Part Numbers | 3905800 (verify by VIN/ESN) |
| Function | Engine oil dipstick tube (oil gauge tube) |
| Engine Compatibility | 5.9L Cummins 12-Valve (6BT), 1989–1998 |
| Vehicle Fitment | Ram 2500 / 3500 (1989–1998) |
| UPC | 190910284212 |
| GTIN | 190910284212 |
| Shipping Weight | Approx. 0.85 lbs |
| Shipping Method | Standard ground; oversized protection required to prevent bending |
| E-Codes / Emissions | Non-emissions component |
| Prop 65 Warning | WARNING: May expose you to chemicals known to the State of California to cause cancer and reproductive harm. Visit www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins |
Frequently Asked Questions
WILL THIS FIT ALL 1989–1998 5.9L CUMMINS ENGINES?
Yes. CUMMINS 3905799 is used across most 6BT/12-valve applications from 1989–1998. Always verify with your ESN for accuracy.
DOES THIS COME WITH THE DIPSTICK?
No. This listing is for the dipstick tube only. The correct dipstick is the CUMMINS 3925016.
WHAT CAUSES DIPSTICK TUBES TO FAIL?
Heat cycling, vibration, and corrosion are the most common causes of cracking or loosening over time.
IS THIS A GENUINE CUMMINS PART?
Yes — CPP Diesel sells only authentic Cummins OEM components for correct fit and reliability.
