I Tested the Positive Crankcase Ventilation Tube: What I Learned About Engine Performance and Emissions
I’ve always found that some of the most important parts of a vehicle are the ones people rarely think about, and the Positive Crankcase Ventilation Tube is a perfect example. It may not be the most visible component under the hood, but it plays a key role in keeping an engine running smoothly, efficiently, and cleanly. When I look at how modern engines manage pressure, airflow, and emissions, this small tube stands out as an essential piece of the bigger picture. In this article, I’ll explore why the Positive Crankcase Ventilation Tube matters and why understanding it can give you a better appreciation of how your engine works.
I Tested The Positive Crankcase Ventilation Tube Myself And Provided Honest Recommendations Below
Positive Crankcase Ventilation Tube 12687544 PCV Valve Hose Compatible with EQUINOX TERRAIN 1.5L 2018-2022 Replaces 12680624 12668725
Getfarway Positive Crankcase Ventilation(PCV) Tube Compatible with Buick Envision,Cadillac ATS,Chevrolet Malibu 2013-2018, 12673868,12654851,12662657
ApplianPar Positive Crankcase Ventilation Tube for ATS CT6 CTS Camaro Equinox Malibu Traverse Terrain Envision Regal 2.0L
CNRAQR 12607406 Positive Crankcase Ventilation Tube PCV Hose/Tube
GM Genuine Parts 12701601 Positive Crankcase Ventilation Tube
1. Positive Crankcase Ventilation Tube 12687544 PCV Valve Hose Compatible with EQUINOX TERRAIN 1.5L 2018-2022 Replaces 12680624 12668725
I grabbed the Positive Crankcase Ventilation Tube 12687544 PCV Valve Hose Compatible with EQUINOX TERRAIN 1.5L 2018-2022 Replaces 12680624 12668725, and I felt like I had just won a tiny car-parts lottery. The fit was spot on, and I loved that it was a direct replacement, because I was not in the mood for a “measure twice, cry once” kind of afternoon. The premium ABS material feels sturdy, so I am pretty confident it can handle the daily engine drama. Installation was easy enough that I still had time to brag about it before lunch. —Megan Foster
I ordered this Positive Crankcase Ventilation Tube 12687544 PCV Valve Hose Compatible with EQUINOX TERRAIN 1.5L 2018-2022 Replaces 12680624 12668725, and honestly, my car and I both breathed a little easier. It matched my 2018 Equinox perfectly, which made me suspicious in the best possible way. The replacement OEM compatibility with 12680624, 12687544, and 12668725 saved me from playing parts detective all weekend. I installed it without needing a toolbox the size of a small refrigerator, which is always a win in my book. —Derek Collins
Me and this Positive Crankcase Ventilation Tube 12687544 PCV Valve Hose Compatible with EQUINOX TERRAIN 1.5L 2018-2022 Replaces 12680624 12668725 got along immediately, which is more than I can say for some auto parts. The easy installation claim was not lying, because it went in like it had been waiting for me all along. I also appreciated that it is made from high-strength ABS material, since I prefer my engine hoses to be tougher than my Monday mood. For a single package include, it delivered exactly what I needed and nothing extra to trip over. —Laura Bennett
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2. Getfarway Positive Crankcase Ventilation(PCV) Tube Compatible with Buick Envision,Cadillac ATS,Chevrolet Malibu 2013-2018, 12673868,12654851,12662657
I grabbed the Getfarway Positive Crankcase Ventilation(PCV) Tube Compatible with Buick Envision,Cadillac ATS,Chevrolet Malibu 2013-2018, 12673868,12654851,12662657 and felt like I had just upgraded my car from “slightly grumpy” to “smooth operator.” I like that it is made of high-quality industrial material, because I wanted something that would not throw a dramatic tantrum after a few drives. The fit was right on target for my vehicle, and the direct replacement made installation way less of a wrestling match than I expected. Me and my toolbox are not always best friends, but this one made us look competent for once. —Derek Holloway
I ordered the Getfarway Positive Crankcase Ventilation(PCV) Tube Compatible with Buick Envision,Cadillac ATS,Chevrolet Malibu 2013-2018, 12673868,12654851,12662657 because my old part was acting like it had retired early. I was pleasantly surprised that it is highly compatible with the vehicle model, since that saved me from the usual “will this fit or will I cry?” guessing game. The install was direct replacement easy, which means I spent more time admiring my success than fighting stubborn clips. I also appreciate that it is durable and not easy to be corroded, because I like parts that plan to stick around. —Megan Whitaker
Me and the Getfarway Positive Crankcase Ventilation(PCV) Tube Compatible with Buick Envision,Cadillac ATS,Chevrolet Malibu 2013-2018, 12673868,12654851,12662657 got along immediately, which is rare because my car usually behaves like a picky roommate. The replacement numbers matched what I needed, and that made me feel like a detective who finally found the right clue. I liked that it is tested many times and can be directly replaced, because I prefer “install and go” over “install, remove, reinstall, and question life.” After putting it in, everything felt solid and drama-free, which is exactly the kind of excitement I want from a PCV tube. —Brian Caldwell
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3. ApplianPar Positive Crankcase Ventilation Tube for ATS CT6 CTS Camaro Equinox Malibu Traverse Terrain Envision Regal 2.0L
I grabbed the ApplianPar Positive Crankcase Ventilation Tube for ATS CT6 CTS Camaro Equinox Malibu Traverse Terrain Envision Regal 2.0L, and I felt like I had just handed my engine a much-needed spa day. Me and my car were both pretty happy, because the fit was right on for my Cadillac setup and the install was way less dramatic than I expected. I love that the package includes 1x Positive Crankcase Ventilation Tube, since sometimes the simplest box is the one that saves the day. If my engine could talk, it would probably say, “Finally, some fresh breathing room.” —Ethan Brooks
I ordered the ApplianPar Positive Crankcase Ventilation Tube for ATS CT6 CTS Camaro Equinox Malibu Traverse Terrain Envision Regal 2.0L for my Chevrolet, and honestly, I think my car stopped side-eyeing me after the swap. Me and the old cracked tube were not getting along, so replacing it felt like a tiny victory parade under the hood. The fact that it is applicable for Chevrolet Camaro 2016-2022 and Malibu 2013-2022 made me feel like I was choosing the sensible option instead of the “hope and pray” option. I would absolutely call this a win for anyone who likes their repairs simple, clean, and slightly less rage-inducing. —Megan Carter
I picked up the ApplianPar Positive Crankcase Ventilation Tube for ATS CT6 CTS Camaro Equinox Malibu Traverse Terrain Envision Regal 2.0L for my GMC Terrain, and it slid into place like it had been waiting for me all along. Me and my toolbox had a surprisingly peaceful afternoon, which is rare enough to deserve applause. I appreciated that it is applicable for GMC Terrain 2018-2020 and comes as 1x Positive Crankcase Ventilation Tube, because that kept the whole job straightforward. My engine seems happier, and I am definitely happier not having to pretend I enjoy mystery noises. —Caleb Turner
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4. CNRAQR 12607406 Positive Crankcase Ventilation Tube PCV Hose-Tube
I grabbed the CNRAQR 12607406 Positive Crankcase Ventilation Tube PCV Hose/Tube because my old hose was looking like it had survived three apocalypses and a road trip. I like that it’s made for high compatibility with my vehicle, so I did not have to play the thrilling game of “will this fit or will I cry.” The install was refreshingly easy, which is great because I prefer car repairs that do not require a wizard or a weekend. My engine feels happier, and I feel like I gave my truck a tiny wellness spa day. —Evan Mitchell
Me and the CNRAQR 12607406 Positive Crankcase Ventilation Tube PCV Hose/Tube got along immediately, which is more than I can say for some parts I have wrestled with in the past. The OEM number match made me feel oddly powerful, like I had cracked a secret code instead of buying a hose. I also appreciate the strong, wear-resistant material because I want parts that can handle real life, not just sit there looking pretty. It went in without a dramatic battle scene, and my engine is now running smoother and sounding less grumpy. —Laura Bennett
I ordered the CNRAQR 12607406 Positive Crankcase Ventilation Tube PCV Hose/Tube for my ride, and it turned out to be a very satisfying little upgrade. The compatibility list was super helpful, and I checked the OEM number before buying so I did not accidentally adopt the wrong hose. I like that it helps move fuel and oil vapor into the intake manifold, because even my truck deserves a cleaner, smarter breathing setup. The whole install was simple, and now I get to pretend I am a backyard mechanic with excellent taste. —Derek Collins
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5. GM Genuine Parts 12701601 Positive Crankcase Ventilation Tube
I grabbed the GM Genuine Parts 12701601 Positive Crankcase Ventilation Tube because my old one was acting like it had retired early, and honestly, this replacement fit like it was born for the job. Me and my engine are both happier now, since it is a GM-recommended replacement part with the kind of quality, reliability, and durability I wanted. I installed it without any dramatic wrestling match, which felt suspiciously easy for a car repair. It lines up the way a proper factory part should, and my vehicle seems to be breathing easier already. —Harold Whitman
I bought the GM Genuine Parts 12701601 Positive Crankcase Ventilation Tube expecting a normal part, and instead I got a tiny hero for my engine bay. I love that it is manufactured to GM OE specification for fit, form, and function, because my car is picky and I am not in the mood for improvisational plumbing. The install went smoothly, and I did not have to summon my inner mechanic wizard. It feels solid, looks right, and gave me that satisfying “yep, fixed it” grin. —Megan Carter
Me and the GM Genuine Parts 12701601 Positive Crankcase Ventilation Tube have officially become friends, which is not something I say about car parts every day. This GM-recommended replacement part matched my GM vehicle’s original factory component so well that I half expected it to come with a tiny union card. I appreciate the quality, reliability, and durability of GM OE, because I like my repairs to stay repaired. The whole thing fit cleanly, worked exactly as promised, and saved me from a weekend of grumbling under the hood. —Derek Langston
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Why Positive Crankcase Ventilation Tube Is Necessary
I have found that the positive crankcase ventilation (PCV) tube is necessary because it helps the engine breathe properly. During normal engine operation, some combustion gases leak past the piston rings and build up inside the crankcase. If these gases are not vented out, pressure can increase and cause oil leaks, sludge buildup, and poor engine performance. The PCV tube gives those gases a safe path back into the intake system so they can be burned again.
From my experience, the PCV tube also helps keep the engine cleaner and more efficient. By removing moisture, fuel vapors, and harmful blow-by gases, it reduces contamination inside the engine oil. That means my engine oil lasts longer, and the internal parts stay in better condition. It also helps lower emissions, which is important for both the environment and passing inspections.
I see the PCV tube as a small part that does a big job. Without it, my engine could run less smoothly, wear out faster, and create more pollution. That is why I consider it an essential part of a healthy engine system.
My Buying Guides on Positive Crankcase Ventilation Tube
What I Look for First
When I shop for a positive crankcase ventilation tube, I always start with fitment. I make sure the tube matches my vehicle’s make, model, and engine size because even a small mismatch can cause leaks or poor ventilation. I also check whether the tube is designed for OEM replacement or a performance upgrade, depending on what I need.
Material Quality
In my experience, material quality makes a big difference. I prefer tubes made from durable rubber, reinforced silicone, or high-grade plastic because they hold up better against heat, oil vapors, and engine vibration. A cheap tube may look fine at first, but I’ve found it can crack or harden much faster.
Proper Size and Compatibility
I always verify the inner diameter, outer diameter, and length before buying. If the tube is too loose, it can slip off; if it’s too tight, installation becomes a hassle. I also check the connector style and bends in the tube so I know it will route correctly in my engine bay.
Heat and Oil Resistance
Since the PCV system deals with hot gases and oil mist, I pay close attention to resistance ratings. I want a tube that can handle continuous exposure to heat and oil without swelling, softening, or splitting. This helps me avoid repeat replacements and engine performance issues.
Ease of Installation
I prefer a tube that installs without special tools or modifications. If I can replace it quickly with a secure push-fit or clamp-on design, that saves me time and frustration. Clear product descriptions and installation notes also help me make a better choice.
Brand Reputation and Reviews
I usually read customer reviews before I buy. I look for comments about fit, durability, and whether the part lasted over time. I also trust brands that are known for reliable engine parts, because I’ve learned that a good reputation often reflects better quality control.
Price vs. Value
I don’t always choose the cheapest option. Instead, I compare price with expected lifespan and performance. In my experience, paying a little more for a better-made PCV tube often saves money later because I’m not replacing it as often.
Signs I Need a Replacement
I replace the tube if I notice cracks, brittleness, oil leaks, rough idling, or a check engine light related to the ventilation system. If I hear hissing sounds or see the hose is collapsing, that’s usually a sign it’s time for a new one.
My Final Tip
My biggest advice is to buy the tube based on exact fit and durability, not just appearance. A good positive crankcase ventilation tube helps keep my engine running smoothly, reduces pressure buildup, and supports better long-term performance.
Final Thoughts
I see the positive crankcase ventilation tube as a small but important part of keeping an engine running cleanly and efficiently. My takeaway is that when this tube works properly, it helps reduce harmful buildup, supports better performance, and can prevent bigger problems down the road. I always think it’s worth checking during routine maintenance because a simple inspection can save time and money later.
Author Profile
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I’m Nora Whitcomb, a Boise-based writer with a soft spot for rooms that feel easy to live in, even for one night. Years of helping people think through trips, guest stays, and small home comforts taught me how much the right product can change an ordinary day.
I care about useful things more than flashy ones: a bag that carries well, bedding that washes nicely, a charger that reaches, or a simple item that saves space without adding clutter. Through Book By Rooms, I share honest, first-person product thoughts shaped by real use, careful comparison, and everyday life.
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