Author Introduction
Hi, I’m Lars from SPETUNER. We build and test diesel performance parts daily on Ford Power Stroke, RAM Cummins, and GMC Duramax trucks. This guide blends shop-floor experience with OEM data so you can diagnose CCV issues on a 6.7 Cummins and fix them the right way.
The CCV (crankcase ventilation) filter sits on top of the valve cover under the plastic dress cover. It separates oil mist from blow-by before vapors are routed back into the intake, protecting the turbo, intercooler, and emissions system. When the filter clogs, crankcase pressure rises and oil can be pushed into the intake—hurting performance, economy, and emissions hardware.
1. Introduction to the 6.7 Cummins CCV Filter
What is the CCV Filter and Why Is It Important?
The CCV filter 6.7 Cummins is a vital component in your engine's crankcase ventilation system. It filters out oil vapors and contaminants, preventing harmful buildup that could damage engine parts. This system helps keep your engine clean and running smoothly, ensuring optimal performance.
Without the CCV filter Cummins 6.7 working properly, oil contaminants can enter the intake system, leading to increased engine wear, lower efficiency, and higher emissions. That’s why regular maintenance and 6.7 Cummins CCV filter replacement is essential to keep everything running as it should.
Neglecting the CCV filter not only risks engine performance but also accelerates the buildup of sludge, which can clog other critical components, like the turbocharger and intercooler, leading to costly repairs. A simple, yet effective 6.7 Cummins CCV filter replacement can save you time and money in the long run.
2. How to Identify a Bad CCV Filter
6.7 Cummins CCV Filter Service Intervals (By Model Year)
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2007.5–2018: Replace every 67,500 miles (≈54 months).
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2019–2024: Replace every 75,000 miles (≈60 months).
Your cluster may show a “Perform Service” reminder for this emissions maintenance. Always follow your specific owner’s manual and on-screen prompts.
Signs of a Failing CCV Filter (6.7 Cummins)
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Rising oil consumption and more frequent top-offs
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Oil film inside the turbo inlet/charge pipe; oily residue around CCV housing
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Rough idle, worse fuel economy, blue/white smoke on cold start
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Noticeable blow-by/vapors; sometimes a “Perform Service” message
Quick Checks You Can Do
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Oil cap test: with the engine idling, loosen the oil cap—excess chuffing or the cap “dancing” can hint at elevated crankcase pressure.
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Visual: pull the dress cover; inspect the CCV housing and inlet pipe for fresh oil.
3. What Happens If the CCV Filter Is Clogged?
Impact on Engine Performance and Efficiency
If your 6.7 Cummins CCV filter becomes clogged, it can have a serious impact on your engine's performance. The primary function of the CCV filter is to remove oil vapors and other contaminants from the crankcase ventilation system. When the filter is clogged, these harmful substances can't be properly filtered out, leading to several issues.
A clogged filter restricts airflow, which reduces the engine's overall efficiency. The increased pressure within the system can also cause oil to leak into the intake manifold, further lowering engine performance. You may notice a decrease in power, poor acceleration, and sluggish engine response — all signs that your CCV filter may be the culprit.
Moreover, the engine might struggle to maintain optimal combustion conditions, which can lead to increased fuel consumption. As the engine compensates for the inefficiency, it will burn more fuel to produce the same amount of power.
Long-Term Damage Risks
Neglecting a clogged CCV filter Cummins 6.7 doesn’t just affect short-term performance; it can also cause long-term damage. Over time, excessive oil buildup and sludge can affect critical engine components, such as the turbocharger, EGR valve, and intake system. These parts rely on a clean and well-maintained ventilation system to function properly, and any obstruction or contamination can cause them to fail prematurely.
In extreme cases, a clogged CCV filter can lead to engine overheating or even complete engine failure if left untreated. The additional strain placed on the engine’s internal components can lead to costly repairs and a potential need for an entire engine rebuild.
So, if you notice any of the symptoms of a clogged CCV filter, don’t wait — address the issue quickly to avoid long-term engine damage and expensive repairs.
4. Recommended Maintenance: How Often Should You Change the CCV Filter?
Industry Standard for Filter Replacement
To keep your 6.7 Cummins CCV filter functioning optimally, it's essential to follow the recommended maintenance schedule. The standard recommendation for 6.7 Cummins CCV filter replacement is every 30,000 miles, but this can vary depending on your specific driving conditions and vehicle usage.
For standard highway driving, this interval should be sufficient to maintain proper engine ventilation. However, if you frequently engage in off-road activities, heavy towing, or other demanding tasks, you might want to inspect the CCV filter more often. Harsh driving conditions can accelerate the buildup of contaminants, requiring more frequent changes.
Regularly replacing the CCV filter Cummins 6.7 as part of your routine maintenance schedule will help prevent costly engine problems, improve fuel efficiency, and extend the life of your vehicle’s key components.
Factors That May Affect Replacement Timing
While the standard 30,000-mile interval works for most drivers, certain factors can impact the frequency of the 6.7 Cummins CCV filter replacement. Here are a few to consider:
- Driving Conditions: If you often drive in dusty environments, such as construction sites or rural areas, the filter may clog faster due to the increased intake of dirt and debris.
- Towing and Heavy Loads: Frequent towing or hauling heavy loads can put additional strain on the engine, causing the CCV system to work harder and clog the filter more quickly.
- Cold Weather: In cold climates, condensation can build up in the engine, leading to quicker filter contamination. If you live in an area with harsh winters, you may need to check the filter more regularly.
Paying attention to these factors and adjusting your filter replacement schedule accordingly will help you keep your engine in peak condition, reducing the risk of unexpected failures.
5. Is a CCV Delete Worth It?
Pros and Cons of CCV System Deletion
The idea of a CCV delete has become popular among some diesel enthusiasts looking for ways to improve engine performance or reduce maintenance. Essentially, a CCV delete involves removing the crankcase ventilation system entirely, bypassing the need for the filter and related components.
Replace vs. Re-Route/Delete (Off-Road Only)
Compliance Note: Tampering with emissions systems is not street-legal in the U.S. Use re-route/delete solutions for off-road/competition only where permitted. Check local laws before modifying.
| Option | Pros | Cons | Best For |
|---|---|---|---|
| Replace with OEM (68002433AC) | Restores OEM ventilation; emissions-legal; predictable service life | Requires periodic replacement | Street-driven trucks |
| Re-Route Kit (to atmosphere/catch can) | Reduces oil mist in intake; cleaner intercooler/turbo | Not emissions-legal on public roads; possible odor/drips if poorly routed | Off-road/competition |
| Full Delete | Simplest intake path | Illegal for on-road; potential fines; risk of deposits if poorly engineered | Track use where allowed |
6. Conclusion: Maintaining Your 6.7 Cummins CCV Filter
Regular 6.7 Cummins CCV filter replacement is a small job that prevents big problems. Use the correct interval for your model year, add a quick inspection at every oil change, and keep your intake tract clean. For off-road builds, a properly engineered re-route kit can further reduce oil mist—but always stay compliant on public roads.
FAQs
Q1: How often should I change the CCV filter on a 6.7 Cummins?
A: 2007.5–2018 at ~67,500 miles; 2019–2024 at ~75,000 miles, or when the cluster shows “Perform Service.” Always follow your owner’s manual.
Q2: What are the symptoms of a clogged CCV filter?
A: Higher oil consumption, oil film in the turbo inlet/charge pipe, rough idle, more smoke on cold start, and sometimes a maintenance reminder.
Q3: Can I clean the CCV filter instead of replacing it?
A: No. The element is designed to be replaced (e.g., Mopar 68002433AC). Cleaning rarely restores proper filtration and can damage the media.
Q4: Is a CCV delete worth it?
A: It can reduce oil mist in the intake for off-road builds, but it’s not emissions-legal for public roads in the U.S. Consider a re-route kit for competition/off-road only.
Q5: Will replacing the CCV filter improve performance or MPG?
A: If the old filter was restricted, restoring proper ventilation can improve drivability, reduce oil carry-over, and help maintain consistent fuel economy.
Q6: How do I know if my diesel filter needs changing?
A6: Signs that your diesel filter needs changing include engine misfires, reduced power, excessive smoke, and poor fuel economy. A clogged filter can restrict fuel flow, leading to poor engine performance.
Q7: How does a bad CCV filter affect my engine?
A7: A bad 6.7 Cummins CCV filter allows contaminants like oil vapors to enter the intake system, leading to sludge buildup, reduced engine efficiency, and potential damage to vital components like the turbocharger and intake valves.
Q8: Can I drive with a clogged CCV filter?
A8: It’s not recommended to drive with a clogged CCV filter Cummins 6.7. Doing so can result in poor engine performance, increased emissions, and even long-term damage to the engine and other components.
Q9: How do I replace my 6.7 Cummins CCV filter?
A9: Replacing your 6.7 Cummins CCV filter is simple. Locate the filter in the crankcase ventilation system, remove the old filter, and replace it with a new one. Be sure to check the surrounding components for any additional signs of contamination.
Q10: What happens if I skip CCV filter maintenance?
A10: Skipping 6.7 Cummins CCV filter replacement can lead to clogging, poor engine performance, higher oil consumption, and long-term engine damage. Regular maintenance helps maintain engine efficiency and avoid costly repairs.
