The 2014 Ram 2500/3500 6.7L Cummins diesel engine is built for heavy-duty towing, hauling, and long-distance reliability. Because of its extreme workload, proper oil selection and maintenance is critical for turbo protection, fuel efficiency, and long engine life.
In this guide, you’ll learn the correct oil type, oil capacity, oil change interval, filter specifications, service cost, and maintenance tips to keep your Cummins engine performing at its best.
What Type of Oil Does 2014 6.7 Cummins Use?
The recommended oil type for the 2014 6.7 Cummins diesel engine is:
- SAE 5W-40 Full Synthetic (Best Overall Choice)
- SAE 15W-40 Diesel Engine Oil (warm climates)
- API CK-4 or CJ-4 specification required
The best performance and protection comes from 5W-40 full synthetic diesel oil, especially in cold starts and towing conditions.
2014 6.7 Cummins Oil Capacity
Oil capacity depends on filter replacement:
Condition | Oil Capacity |
|---|---|
With oil filter change | 12 quarts (11.4 liters) |
Without filter change | ~11 quarts |
Always verify oil level using the dipstick after filling. Overfilling can cause crankcase pressure issues and oil foaming.
2014 6.7 Cummins Oil Change Interval
Recommended oil change intervals vary by usage:
- Normal driving: 7,500 – 10,000 miles
- Towing / heavy load: 5,000 – 7,500 miles
- Severe dusty conditions: 4,000 – 5,000 miles
- Time-based rule: At least every 6 months
2014 6.7 Cummins Oil Change Cost
Typical cost breakdown:
Service Type | Estimated Cost |
|---|---|
DIY Oil Change | $70 – $120 |
DIY + OEM Filter | $100 – $160 |
Professional Service | $150 – $300 |
Best Oil for 6.7 Cummins Diesel Engine
- Shell Rotella T6 5W-40 Full Synthetic
- Mobil 1 Turbo Diesel Truck 5W-40
- Valvoline Premium Blue 15W-40 / 5W-40
- Chevron Delo 400 XLE
- Mopar OEM 5W-40 Diesel Oil
Synthetic diesel oil is strongly recommended for turbo protection, fuel economy, and longer service intervals.
How to Change Oil in 2014 6.7 Cummins
- Warm engine for 5–10 minutes
- Park on level ground and secure vehicle
- Drain old oil completely
- Replace oil filter (recommended every change)
- Reinstall drain plug with proper torque
- Refill with 12 quarts of 5W-40 oil
- Check oil level using dipstick
- Start engine and inspect for leaks
Common 6.7 Cummins Engine Problems Related to Oil
- Oil leaks from valve cover or seals
- Turbo wear from low-quality oil
- Excess soot buildup in oil
- Crankcase pressure issues from overfill
- Cold-start wear in winter conditions
Signs You Need an Oil Change
- Dark black or thick oil
- Reduced engine performance
- Increased engine noise
- Burning smell or smoke
- Oil pressure warning light
Maintenance Tips for Longer Engine Life
- Use only CK-4 rated diesel oil
- Never exceed oil capacity
- Replace oil filter every change
- Check oil every fuel fill-up
- Follow strict 7,500-mile interval under load
Frequently Asked Questions (FAQ)
What oil does a 2014 6.7 Cummins take?
The recommended oil is 5W-40 full synthetic diesel engine oil meeting API CK-4 specification.
How much oil does a 2014 Cummins take?
It takes approximately 12 quarts with an oil filter change.
Can I use 15W-40 instead of 5W-40?
Yes, but 5W-40 synthetic provides better cold-start and turbo protection.
How often should I change Cummins oil?
Every 7,500–10,000 miles or 6 months, depending on usage.
What happens if I use wrong oil?
It can lead to turbo wear, sludge buildup, reduced efficiency, and engine damage over time.
Final Thoughts
The 2014 6.7 Cummins is a powerful diesel engine designed for heavy workloads. Using the correct synthetic oil and maintaining strict service intervals ensures maximum durability, turbo protection, and long engine life under demanding conditions.