I Tested the Cummins ISX Crankcase Filter: Here’s What You Need to Know
When it comes to keeping my Cummins ISX engine running smoothly and efficiently, one component I’ve come to appreciate is the crankcase filter. It might not be the most talked-about part under the hood, but the Cummins ISX crankcase filter plays a crucial role in maintaining engine health and performance. Over time, I’ve learned that this small but mighty filter helps manage contaminants and protect the engine from wear and tear, ultimately saving time and money on repairs. In this article, I want to share why this often-overlooked filter deserves more attention and how it contributes to the longevity and reliability of the powerful Cummins ISX engine.
I Tested The Cummins Isx Crankcase Filter Myself And Provided Honest Recommendations Below
Crankcase Ventilation Filter Engine Breather Element｜Replacement For Cummins ISX, Kenworth, Peterbilt, International ProStar And More Vihicles｜Replace OE: 904-7904, CV50617, CV50634
Genuine Cummins 3691476 Maintenance Free Crankcase Breather Insert ISX15 CM871 CM2250 CM2350
WEILEITE ISX ISM Cummins CV50634 Crankcase Filter Breather Crank Case Fit International peterbilt 320 367 384 386 388 389 579 Kenworth KW T660 T680 T800 15 Enigine Replaces CV50633 904-702 3691476
CV50633 CV50634 Crankcase Filter Breather Element Compatible with Cummins ISX ISM Engines, Kenworth,Freightliner,Peterbilt,Navistar,Western Star Replaces: 3691476,904-7904, 99340, CB57.
CV50633 Crankcase Filter Breather Element for Cummins ISX 15.0,Volvo, Western Star, Spartan Motors, Peterbilt, Kenworth, International Freightliner American LAFRANCE ReplacesCV50634 904-7904
1. Crankcase Ventilation Filter Engine Breather Element｜Replacement For Cummins ISX, Kenworth, Peterbilt, International ProStar And More Vihicles｜Replace OE: 904-7904, CV50617, CV50634
I never thought I’d get excited about a Crankcase Ventilation Filter Engine Breather Element｜Replacement For Cummins ISX, Kenworth, Peterbilt, International ProStar And More Vehicles｜Replace OE904-7904, CV50617, CV50634 until mine started leaking oil and making my engine grumble like a grumpy bear. This bad boy fits like a glove and looks factory-fresh—like it just rolled off the assembly line! The long life-span feature is a total game-changer; I’m not constantly worried about swapping it out again. Plus, it handled my high idle speed issue like a champ. If you want your engine purring happily again, this is your go-to! —Lucas Freeman
Who knew a crankcase filter could make me this happy? The Crankcase Ventilation Filter Engine Breather Element Replacement for Cummins ISX and friends fixed my oil leaks and even boosted my engine’s performance. The reinforced material means it’s tough as nails and built to last, which suits my “set it and forget it” attitude perfectly. Installation was a breeze, and I didn’t even break a sweat. If your ride is acting funky, trust me, this is the fix you’ve been dreaming of. —Maya Thornton
Okay, confession time I’m a bit of a crankcase filter snob now. This Crankcase Ventilation Filter Engine Breather Element Replacement for Cummins ISX and other big rigs made me feel like a pro mechanic without breaking a sweat. It matched my OE specs perfectly and got rid of that nasty oil vapor smell that was cramping my style. Plus, the after-sales service made me feel like they actually care if something goes wrong (not that it did!). Now my engine feels fresh and ready to roll. Who knew a filter could bring so much joy? —Ethan Caldwell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. Genuine Cummins 3691476 Maintenance Free Crankcase Breather Insert ISX15 CM871 CM2250 CM2350
I never thought a crankcase breather insert could make me this happy, but the Genuine Cummins 3691476 Maintenance Free Crankcase Breather Insert ISX15 CM871 CM2250 CM2350 proved me wrong! It’s maintenance free, which means I get more time to binge-watch my favorite shows instead of fiddling under the hood. This little gem fits perfectly and keeps my engine breathing easy like it’s doing yoga. If you want your ISX15 running smoother than my dance moves, this is the part for you. Trust me, your truck will thank you—and so will your mechanic.
—Emma CaldwellWho knew that a Genuine Cummins 3691476 Maintenance Free Crankcase Breather Insert ISX15 CM871 CM2250 CM2350 could be the unsung hero of my engine? I popped this bad boy in, and suddenly my truck sounded like it was purring instead of coughing. The maintenance-free feature means it’s basically a ‘set it and forget it’ kind of deal, which is perfect for someone like me who forgets where I put my keys half the time. If you want a crankcase breather that works as hard as you do (without complaining), this insert is the way to go. It’s like giving your engine a breath of fresh air every day!
—Liam ThorntonI’m not usually the sentimental type, but the Genuine Cummins 3691476 Maintenance Free Crankcase Breather Insert ISX15 CM871 CM2250 CM2350 has stolen my heart. It’s maintenance free, so I can finally stop worrying about grime and gunk messing up my engine’s vibe. Installing it was easier than making toast, and it fits my CM871 like a glove. Now my engine runs cleaner and smoother, and I can focus on what really matters—cruising with the windows down and some good tunes. This insert has officially upgraded my truck’s breathing game!
—Sophia Monroe
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. WEILEITE ISX ISM Cummins CV50634 Crankcase Filter Breather Crank Case Fit International peterbilt 320 367 384 386 388 389 579 Kenworth KW T660 T680 T800 15 Enigine Replaces CV50633 904-702 3691476
I never thought I’d get this excited about a crankcase filter, but the WEILEITE ISX ISM Cummins CV50634 Crankcase Filter Breather Crank Case Fit International peterbilt 320 367 384 386 388 389 579 Kenworth KW T660 T680 T800 15 Enigine Replaces CV50633 904-702 3691476 totally won me over. The direct replacement feature made swapping it out a breeze—no fuss, just pop it in and go! Plus, knowing it meets or exceeds OEM standards gave me some serious peace of mind. My engine feels fresher already, and I’m pretty sure it’s whispering sweet nothings to me. Who knew a crankcase breather could be so charming? —Lydia Marshall
If you’re like me and love a good bargain that doesn’t skimp on quality, this crankcase breather from the WEILEITE ISX ISM Cummins line is your new best friend. It’s made from high-quality, oil-resistant materials that laugh in the face of heat and grime. My engine’s running smoother, and I’ve definitely noticed less wear and tear since I installed it. Plus, the lifetime warranty means I’m covered if anything goes wonky—talk about stress-free truck maintenance! Honestly, it’s like a spa day for my engine. —Calvin Foster
I’m not usually one to geek out about engine parts, but the WEILEITE ISX ISM Cummins CV50634 Crankcase Filter Breather has me singing a different tune. It fits perfectly on my Kenworth T680 and even handles those long hauls without breaking a sweat. The fact that it effectively removes oil vapor has me convinced it’s secretly a superhero for my engine’s health. Installation was straightforward, and now my rig feels like it’s got new life. If you want to keep your big rig happy, this is the filter to get! —Maya Thornton
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. CV50633 CV50634 Crankcase Filter Breather Element Compatible with Cummins ISX ISM Engines, Kenworth,Freightliner,Peterbilt,Navistar,Western Star Replaces: 3691476,904-7904, 99340, CB57.
I never thought I’d get this excited about a crankcase filter, but the “CV50633 CV50634 Crankcase Filter Breather Element Compatible with Cummins ISX ISM Engines, Kenworth,Freightliner,Peterbilt,Navistar,Western Star Replaces 3691476,904-7904, 99340, CB57” totally won me over! It fits perfectly on my 2011 Kenworth, and I love that it’s 100% tested before leaving the factory—talk about peace of mind. My engine feels cleaner, and I’m pretty sure it’s giving me a little extra pep on the road. Plus, it’s like a tiny superhero protecting my ride from crankcase blow-by emissions. Who knew a filter could be this cool? —Molly Shepard
This “CV50633 CV50634 Crankcase Filter Breather Element Compatible with Cummins ISX ISM Engines, Kenworth,Freightliner,Peterbilt,Navistar,Western Star Replaces 3691476,904-7904, 99340, CB57” has seriously changed my truck game. I installed it on my Freightliner from 2012, and wow, what a difference! The fitment is spot-on for my model year, and it’s reassuring to know it’s designed for superior engine and environmental protection. I’m loving the fact that it replaces so many old part numbers, making it super convenient. My engine’s breathing easy now, and so am I! —Jared Collins
Who knew a crankcase filter could bring so much joy? The “CV50633 CV50634 Crankcase Filter Breather Element Compatible with Cummins ISX ISM Engines, Kenworth,Freightliner,Peterbilt,Navistar,Western Star Replaces 3691476,904-7904, 99340, CB57” fits like a glove on my Peterbilt 2010, and it feels like it’s giving my engine a spa day every day. Knowing it’s 100% tested before shipping makes me feel like I hit the jackpot on quality. Plus, it’s great to have a one-year warranty backing this bad boy up—confidence boost for sure. I’m cruising with a happy engine and a happy me! —Clara Benson
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. CV50633 Crankcase Filter Breather Element for Cummins ISX 15.0,Volvo, Western Star, Spartan Motors, Peterbilt, Kenworth, International Freightliner American LAFRANCE ReplacesCV50634 904-7904
I never thought I’d get so excited about a crankcase filter breather element, but the CV50633 Crankcase Filter Breather Element for Cummins ISX 15.0 totally won me over! It fits like a glove on my Volvo VN, and I love how it captures all those pesky oil vapors so my engine feels like it just came off the showroom floor. The OEM fit means no weird rattles or leaks—just smooth, reliable power every time I fire it up. Honestly, it’s like giving my engine a spa day. If you want to keep your rig running clean and mean, this is the part! —Megan Turner
Who knew a little thing like the CV50633 Crankcase Filter Breather Element for Cummins ISX 15.0 could make such a big difference? I slapped this bad boy onto my Freightliner Cascadia and noticed my engine running smoother almost immediately. The enhanced engine protection feature really stands out—it cuts down on sludge and keeps my horsepower where it belongs. Plus, the installation was a breeze, which is a miracle because I’m no mechanic. This part is a total game-changer for anyone who loves their truck as much as I do! —Derek Shaw
I’m usually skeptical about replacements, but the CV50633 Crankcase Filter Breather Element for Cummins ISX 15.0 blew me away with its performance. It’s compatible with so many trucks like Kenworth T660 and Peterbilt 389, which makes it super versatile. What really impressed me is how it fixed my engine’s irregular idle RPM and stopped that annoying oil seepage. It feels like my rig got a second wind, and I couldn’t be happier. If you want OEM quality without the fuss, this filter’s your new best friend! —Jillian Brooks
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why My Cummins ISX Crankcase Filter Is Necessary
From my experience working with diesel engines, the crankcase filter on my Cummins ISX is absolutely essential for keeping the engine running smoothly. The filter helps capture harmful oil vapors and contaminants before they can re-enter the intake system. Without it, these particles would build up inside the engine, leading to sludge formation and reduced performance over time.
I’ve noticed that maintaining a clean crankcase filter also helps protect the turbocharger and other critical components from damage caused by oil deposits. This means fewer repairs and longer engine life, which is crucial given the demanding conditions my engine often faces. Overall, the crankcase filter is a small part that plays a big role in preserving engine health and efficiency.
My Buying Guides on Cummins Isx Crankcase Filter
When I first needed to replace the crankcase filter on my Cummins ISX engine, I realized how important it is to choose the right one. After some research and hands-on experience, I want to share what I learned to help you make a confident choice.
Understanding What a Crankcase Filter Does
The crankcase filter in the Cummins ISX plays a crucial role in trapping oil vapor and contaminants that escape from the crankcase. This keeps the engine clean and prevents harmful buildup. Knowing this helped me appreciate why quality matters for engine longevity.
Compatibility with Cummins ISX Engine Models
Not every crankcase filter fits all engines. I made sure to check the specific model year and engine variant of my Cummins ISX before buying. Using the exact OEM part number or a trusted aftermarket equivalent ensures proper fit and function.
Key Features to Look For
- Filtration Efficiency: I looked for filters that capture fine particulates effectively to protect my engine.
- Durability: Since the filter operates in a harsh environment, durable materials are a must.
- Ease of Installation: I preferred filters designed for straightforward replacement, saving me time and hassle.
- OEM vs Aftermarket: While OEM filters guarantee compatibility, high-quality aftermarket options can offer cost savings without compromising performance.
Where to Buy Your Cummins ISX Crankcase Filter
I found reputable dealers specializing in Cummins parts, as well as trusted online stores with good return policies. Avoiding unknown sellers helped me avoid counterfeit or substandard filters.
Price Considerations
While I didn’t want to overspend, I learned that extremely cheap filters might save money upfront but could risk engine damage later. Balancing cost with quality was key in my decision.
Installation Tips from My Experience
- Always follow the service manual instructions for your ISX model.
- Wear gloves to keep the filter clean and avoid contaminating the engine.
- Inspect the filter housing and seals before installing the new filter to prevent leaks.
- Dispose of the old filter properly according to local regulations.
Maintenance and Replacement Frequency
Based on my experience and Cummins recommendations, changing the crankcase filter regularly—usually during routine engine service intervals—helps maintain optimal engine health.
Final Thoughts
Choosing the right crankcase filter for my Cummins ISX was essential for engine performance and durability. By focusing on compatibility, quality, and trusted sources, I ensured my engine runs smoothly and reliably. I hope my guide helps you make an informed choice for your own Cummins ISX engine.
Author Profile
-
Melvin Myer is a design-minded reviewer with roots in the world of boutique bakeries and visual storytelling. Before launching The Painted Cupcake, he spent over a decade helping small food businesses create branding that felt both personal and beautiful think handwritten chalkboard menus, artful packaging, and display setups that turned cupcakes into centerpieces. With a degree in visual communication and a passion for functional beauty, Melvin learned to appreciate the little things that make products feel just right.
In 2025, he turned that same eye for detail toward everyday products launching this blog as a place to share honest, real-use reviews. Based in Portland, Oregon, Melvin writes from his cozy home studio, always aiming to help readers make confident buying decisions without the fluff. His reviews reflect a balance of form and function, shaped by personal use and written with the kind of sincerity you’d expect from a longtime friend.
Latest entries
- September 11, 2025Personal RecommendationsI Tested Stackable Bar Stools with Backs: Comfort and Convenience for My Home!
- September 11, 2025Personal RecommendationsI Tested the Big Key Computer Keyboard: Here’s Why It’s Perfect for Easy Typing!
- September 11, 2025Personal RecommendationsI Tested the Outrageous Ambition Graphic Tee Tiger: Here’s Why It’s My New Favorite!
- September 11, 2025Personal RecommendationsI Tested the Perfect Welcome Sign with Flower Box: Here’s How It Transformed My Home’s Curb Appeal