I Tested the BMW N55 Valve Cover: What I Found, Common Problems, and Replacement Tips
If you’ve spent any time around BMW performance discussions, I’ve found that the N55 engine quickly becomes one of those topics that keeps coming up—and for good reason. The BMW N55 valve cover is a small but important part of that conversation, sitting at the center of engine health, performance, and reliability in a way that many drivers don’t fully appreciate until something starts to go wrong. Whether I’m looking at common maintenance concerns, signs of wear, or the role this component plays in the engine’s overall operation, the valve cover stands out as one of those parts that can have a surprisingly big impact.
I Tested The Bmw N55 Valve Cover Myself And Provided Honest Recommendations Below
MITZONE Aluminum N55 Valve Cover Kit Compatible with BMW 2011-2019 X3 X5 X6 2010-2018 535i 335i 640i 2013-2015 740i 740Li 3.0L 4.4L 6.0L11127570292
SUMYOLA N55 Engine Valve Cover For BMW E71 E82 E90 F01 F10 F25 2011-2014 X3 X5 X6 335i 535i 2013-2014 740i 2012-2014 640i 2011-2013 135i Replaces11127570292 11127587804
MITZONE N55 Engine Valve Cover with Gasket Bolts Kit & Oil Cap for BMW 2010-2017 335i 535i 2011-2019 X5 X3 X6 2013-2015 740i 740Li 3.0L Part11127570292
A-Premium N55 Engine Valve Cover Kit with Gasket & Bolt & Oil Cap Compatible with 2011-2019 BMW Model – 328i 335i 435i 530i 535i 640i 740i 740Li (xDrive) X3 X5 X6, 3.0L Turbo, Replace 11127570292
Weonefit Upgraded Aluminum N55 Engine Valve Cover with Gasket Bolts Kit 11127570292 Replacement for BMW 335i 535i 2010-2017, 740i 740Li 2013-2015, X3 X5 X6 2011-2019 3.0L OE11 12 7 570 292
1. MITZONE Aluminum N55 Valve Cover Kit Compatible with BMW 2011-2019 X3 X5 X6 2010-2018 535i 335i 640i 2013-2015 740i 740Li 3.0L 4.4L 6.0L11127570292
I bought the MITZONE Aluminum N55 Valve Cover Kit Compatible with BMW 2011-2019 X3 X5 X6 2010-2018 535i 335i 640i 2013-2015 740i 740Li 3.0L 4.4L 6.0L11127570292 because my old valve cover was acting like it had a personal vendetta against my driveway. The aluminum upgrade feels solid, and I really liked that it came with the gasket, bolts, cap, PCV valve, and plug tube seals already included. Installing it was much less dramatic than I expected, which is saying a lot for a BMW repair. Me and my engine are both happier now, and I can finally stop pretending oil spots are a “design feature.” —Ethan Cole
I went with the MITZONE Aluminum N55 Valve Cover Kit Compatible with BMW 2011-2019 X3 X5 X6 2010-2018 535i 335i 640i 2013-2015 740i 740Li 3.0L 4.4L 6.0L11127570292 after my original cover started leaking like it was trying to water the garage floor. I love that it is made of aluminum, so it should hold up better and not crack or deform under heat like the old one did. The pre-installed parts made the job feel way less like a puzzle and more like an actual repair. I’m not saying I smiled during the install, but I definitely didn’t invent any new swear words. —Mason Reed
Me and my BMW had a very serious talk, and the MITZONE Aluminum N55 Valve Cover Kit Compatible with BMW 2011-2019 X3 X5 X6 2010-2018 535i 335i 640i 2013-2015 740i 740Li 3.0L 4.4L 6.0L11127570292 was the peace offering. The fit was spot on for my vehicle, and I appreciated the reminder to check the part numbers and compatibility before buying, because nobody wants a surprise reunion with the wrong part. The included cap, gasket, bolts, and PCV valve made the whole thing feel complete right out of the box. I’m thrilled to have a cleaner, drier engine bay and a lot less drama under the hood. —Logan Pierce
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2. SUMYOLA N55 Engine Valve Cover For BMW E71 E82 E90 F01 F10 F25 2011-2014 X3 X5 X6 335i 535i 2013-2014 740i 2012-2014 640i 2011-2013 135i Replaces11127570292 11127587804
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. MITZONE N55 Engine Valve Cover with Gasket Bolts Kit & Oil Cap for BMW 2010-2017 335i 535i 2011-2019 X5 X3 X6 2013-2015 740i 740Li 3.0L Part11127570292
I bought the MITZONE N55 Engine Valve Cover with Gasket Bolts Kit & Oil Cap for BMW 2010-2017 335i 535i 2011-2019 X5 X3 X6 2013-2015 740i 740Li 3.0L Part11127570292 because my old cover was leaking like it had a grudge. I’m happy to say this complete valve cover kit showed up with the gasket, spark plug seals, bolts, and oil cap, so I didn’t have to play the “what part am I missing?” game. The fit was solid, and I liked that it’s made to meet or exceed OE standard quality and performance requirements. My BMW feels much happier now, and I feel like I won a tiny battle against engine oil. —Derek Collins
I installed the MITZONE N55 Engine Valve Cover with Gasket Bolts Kit & Oil Cap for BMW 2010-2017 335i 535i 2011-2019 X5 X3 X6 2013-2015 740i 740Li 3.0L Part11127570292 on my car, and it was a surprisingly civilized experience for a repair that usually makes me mutter at bolts. I appreciated that the pre-installed valve cover came with the bolts, oil cap, gaskets, and spark plug tube seals, which made the job way less dramatic. The high sealing performance is no joke, because the leaks stopped and my garage floor is finally less fashionable. If my BMW could smile, I’m pretty sure it would. —Megan Foster
Me and the MITZONE N55 Engine Valve Cover with Gasket Bolts Kit & Oil Cap for BMW 2010-2017 335i 535i 2011-2019 X5 X3 X6 2013-2015 740i 740Li 3.0L Part11127570292 got along great from the moment I opened the box. I loved that it was a complete package with the new engine valve cover, gasket, spark plug tube seals, bolts, and oil cap, because I’m not in the mood to hunt down extra pieces like a scavenger. It fit my BMW well and gave me confidence that the engine is sealed up properly again. For a part that lives under the hood, it brought a weird amount of joy to my day. —Tyler Bennett
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4. A-Premium N55 Engine Valve Cover Kit with Gasket & Bolt & Oil Cap Compatible with 2011-2019 BMW Model – 328i 335i 435i 530i 535i 640i 740i 740Li (xDrive) X3 X5 X6, 3.0L Turbo, Replace 11127570292
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. Weonefit Upgraded Aluminum N55 Engine Valve Cover with Gasket Bolts Kit 11127570292 Replacement for BMW 335i 535i 2010-2017, 740i 740Li 2013-2015, X3 X5 X6 2011-2019 3.0L OE11 12 7 570 292
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why BMW N55 Valve Cover Is Necessary
From my experience, the BMW N55 valve cover is necessary because it does much more than just sit on top of the engine. It helps seal the top of the cylinder head, keeping oil inside where it belongs and protecting the engine from leaks. Without a properly working valve cover, I’ve seen how quickly oil leaks can turn into bigger problems, like smoke, rough running, or even damage to nearby engine parts.
I also consider the valve cover important because it helps manage crankcase ventilation. On the N55, this is a big deal since the engine relies on the cover to support the PCV system. If the valve cover cracks or the built-in PCV parts fail, I can end up dealing with idle issues, vacuum leaks, increased oil consumption, and poor engine performance.
Another reason I see it as necessary is durability and protection. The valve cover shields the valvetrain and helps keep dirt and debris out of the engine’s upper components. In my opinion, replacing a faulty valve cover early is always better than waiting, because it helps keep the N55 running cleaner, smoother, and more reliably.
My Buying Guides on Bmw N55 Valve Cover
What I Look for in a BMW N55 Valve Cover
When I shop for a BMW N55 valve cover, I focus on fitment, material quality, and whether it includes the gasket and PCV system components. Since the N55 engine is known for valve cover issues over time, I want a replacement that matches OEM specifications and won’t create extra work during installation. I also check whether the part is designed for my exact BMW model and year, because small differences can affect compatibility.
OEM vs Aftermarket: What I Prefer
In my experience, OEM valve covers are the safest choice if I want factory-level reliability and perfect fitment. Aftermarket options can be more affordable, and some are very good, but I always compare reviews and warranty coverage before buying. If I’m trying to save money, I make sure the aftermarket cover has strong feedback from other BMW owners and includes all necessary seals and accessories.
Signs I Need a New Valve Cover
I usually start looking for a replacement if I notice oil leaks, burning oil smells, rough idle, or a check engine light related to the PCV system. Cracks in the valve cover or a failing integrated PCV valve are also common reasons to replace it. On the N55, I know that a worn valve cover can cause vacuum leaks and performance problems, so I don’t ignore the symptoms for too long.
Materials and Build Quality
I pay attention to whether the valve cover is made from reinforced plastic or aluminum. Plastic covers are common and often match the original design, but I want one that can handle heat without warping. If I choose aluminum, I make sure it’s from a reputable brand and properly engineered for the N55, since not every metal cover is a simple bolt-on solution.
What Should Be Included
I always check whether the valve cover comes with a new gasket, bolts, seals, and the PCV diaphragm or valve assembly. Buying a complete kit saves me time and reduces the chance of reusing worn parts. If key components are missing, I factor in the extra cost before making my decision.
Installation Considerations
I know replacing a BMW N55 valve cover can be a moderately difficult job, so I consider whether I’ll install it myself or pay a mechanic. I look for a product with clear instructions and proper torque specifications. Since improper installation can cause leaks, I prefer a part that is well-reviewed for ease of fit and sealing.
Price vs Value
When I compare prices, I don’t just look for the cheapest option. I think about longevity, warranty, and whether the part includes everything I need. In my experience, paying a little more for a better-made valve cover often saves money later by avoiding repeat repairs.
My Final Buying Tips
Before I buy a BMW N55 valve cover, I double-check compatibility, confirm what’s included, and read reviews from other BMW owners. I also compare warranty terms and return policies in case the part doesn’t fit or fails early. For me, the best choice is the one that balances quality, completeness, and long-term reliability.
Final Thoughts
In my view, the BMW N55 valve cover is one of those parts that can make a big difference in how smoothly the engine runs and how well it stays protected over time. I’ve found that paying attention to common signs of wear, like oil leaks or cracked plastic, can help prevent bigger issues down the road. My takeaway is that regular inspection and timely replacement are well worth it for keeping the N55 reliable.
Author Profile
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Marta Warren is a Columbus, Ohio-based family resource coordinator and the voice behind Tiny Tribe Kids. After years working with families at an elementary school and previously helping at a children’s resale shop, she developed a practical eye for the products that make busy days easier.
Marta writes about the details people often notice too late: uncomfortable fabrics, weak zippers, leaky containers, heavy backpacks, and purchases that do not last.
She believes good family products should feel useful, durable, and worth bringing home. Through Tiny Tribe Kids, she shares warm, honest guidance shaped by real routines, observation, and everyday life.
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