SKU: 73327422072

BMW Auxiliary Coolant Reservoir Cap

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Description

BMW Auxiliary Coolant Reservoir CapThe Precision Raceworks Auxiliary Coolant Reservoir Cap is a functional and stunningly stylish way to add a nice touch to any engine bay! This cap come in three color options so there is always a color that will work for you! Black with Billet, Black with Blue, and the Stealth series (all black). Many people don't realize it but the OEM caps have a pressure release valve built into them. Often times aftermarket companies don't know this either or just

The Precision Raceworks Auxiliary Coolant Reservoir Cap is a functional and stunningly stylish way to add a nice touch to any engine bay!

This cap come in three color options so there is always a color that will work for you! Black with Billet, Black with Blue, and the Stealth series (all black).

Many people don't realize it but the OEM caps have a pressure release valve built into them. Often times aftermarket companies don't know this either or just don't care. But our team cares about proper function just as much as we care about the appearance in every product we design. For pressure relief, our caps incorporate the OEM internals, so you get all the functionality of the original caps, ensuring a safe and reliable system in place.

These caps offer superior style and performance-grade components that guarantee a reliable fit every time. Durable billet aluminum construction provides long-lasting protection and dependability that will upgrade your engine bay for years to come.

Other companies make covers that install with adhesive over your factory caps and can come off over time. These caps offer superior style and performance-grade components that replace the factory cap not just cover it up. Durable billet aluminum construction provides long-lasting protection and dependability that will upgrade your engine bay for years to come!

 

PLEASE NOTE:

These do require assembly and swapping the pressure relief valves from your old caps to your new billet caps. 

 

Fitment Note

If your primary expansion tank cap looks like this:

You will need to purchase a different coolant expansion tank cap to use as the donor cap. 

BMW Part number 17117639021

  • Weight: 0.24 lbs
  • Material type: Anodized Aluminum
  • O-Ring Material: Viton
  • Retains OEM Pressure Relief: YES

            Fitments

            • Bmw 228i 2021 to 2023
            • Bmw 228ix 2020 to 2023
            • Bmw 230i 2017 to 2023
            • Bmw 230ix 2017 to 2023
            • Bmw 330e 2016 to 2023
            • Bmw 330ex 2021 to 2023
            • Bmw 330i 2017 to 2023
            • Bmw 330ix 2017 to 2023
            • Bmw 340i 2016 to 2019
            • Bmw 340ix 2016 to 2019
            • Bmw 430i 2017 to 2023
            • Bmw 430ix 2017 to 2023
            • Bmw 440i 2017 to 2020
            • Bmw 440ix 2017 to 2020
            • Bmw 530e 2017 to 2023
            • Bmw 530ex 2017 to 2023
            • Bmw 530i 2017 to 2023
            • Bmw 530ix 2017 to 2023
            • Bmw 540i 2017 to 2023
            • Bmw 540ix 2017 to 2023
            • Bmw 550i 2010 to 2016
            • Bmw 550ix 2010 to 2017
            • Bmw 640ix 2018 to 2020
            • Bmw 650i 2011 to 2018
            • Bmw 650ix 2012 to 2018
            • Bmw 740ex 2017 to 2018
            • Bmw 740i 2016 to 2023
            • Bmw 740ix 2016 to 2022
            • Bmw 745ex 2019 to 2022
            • Bmw 750ex 2024
            • Bmw 750i 2009 to 2019
            • Bmw 750ix 2010 to 2022
            • Bmw 750li 2009 to 2015
            • Bmw 750lix 2010 to 2015
            • Bmw 760ix 2023
            • Bmw 760li 2010 to 2014
            • Bmw 840i 2020 to 2023
            • Bmw 840ix 2020 to 2023
            • Bmw Alpina B7 2010 to 2022
            • Bmw Alpina B7l 2010 to 2015
            • Bmw Alpina B7lx 2011 to 2014
            • Bmw Alpina B7x 2011 to 2014
            • Bmw Alpina Xb7 2021 to 2023
            • Bmw Hybrid 3 2013
            • Bmw Hybrid 5 2012 to 2013
            • Bmw Hybrid 7 2010 to 2012
            • Bmw Hybrid 7l 2010 to 2014
            • Bmw Hybrid X6 2010
            • Bmw I3 2014 to 2021
            • Bmw I3s 2018 to 2021
            • Bmw I8 2015 to 2020
            • Bmw M2 2019 to 2023
            • Bmw M235ix 2020 to 2023
            • Bmw M240i 2017 to 2023
            • Bmw M240ix 2017 to 2023
            • Bmw M3 2014 to 2023
            • Bmw M340i 2019 to 2023
            • Bmw M340ix 2019 to 2023
            • Bmw M4 2014 to 2023
            • Bmw M4 Gts 2017
            • Bmw M440i 2021 to 2023
            • Bmw M440ix 2021 to 2023
            • Bmw M5 2012 to 2023
            • Bmw M5 Cs 2022
            • Bmw M550ix 2017 to 2023
            • Bmw M6 2012 to 2018
            • Bmw M760ix 2017 to 2022
            • Bmw M8 2020 to 2023
            • Bmw M850ix 2019 to 2023
            • Bmw X1 2016 to 2023
            • Bmw X2 2018 to 2023
            • Bmw X3 2018 to 2023
            • Bmw X4 2018 to 2023
            • Bmw X5 2010 to 2023
            • Bmw X6 2009 to 2023
            • Bmw X7 2019 to 2023
            • Bmw Xm 2023
            • Bmw Z4 2019 to 2023
            • Toyota Supra 2019 to 2023
            Shipping Notes
            • Free Standard Shipping on $100+ Orders to the USA.
            • Except Preorder products are shipped in 48 hours.
            • Delivery to the USA:
            1. Standard Shipping : 3-10 business days
            • If time is of the essence, please consider selecting expedited delivery for faster service.
            Exchange/Return Notes
            • We offer a 30-day return/exchange service after receiving.
            • Final sale items are not eligible for returns or exchanges.
            • To process your return/exchange, please contact us at [email protected]
            • Please click here for more details>>> Return & Exchange Policy
            SKU: 73327422072

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            4.7 ★★★★★
            Based on 26 reviews
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            Tharin
            Massapequa, US
            ★★★★★ 5
            BUY THIS ONE!
            Model: NewSLS50_52
            This is one of the good ones. There are other brands just as good, and manny brands are worse, but this handles well, rolls down easily, doesn't come off at all easily, and adapts to dips and curves like a champ. Appropriately heavy and dead, I'm happy with the way it smothers panel resonances and even at muffling direct sound, like a big hand over my Uncle Harry's eternally noisy mouth. You can rip the foil but you have to work hard at doing that. Remember to buy a brayer; you can roll overlaps nice and thin. Also remember to pre-wipe the sheet metal with a decent solvent like acetone or Stoddard/Varsol. It should last forever.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on April 26, 2025
            H
            Verified Purchase
            Harvey
            Cuba, US
            ★★★★★ 5
            Good stuff, but watch the temp
            Model: NewSLS50_52
            I used this in my single cab pickup truck (89 ford.) It only took half the box (10 sheets or 25 square feet) to do the floors, but I bought the big box because I plan to do the doors, back wall, and maybe the roof as well. One thing I learned is that the temperature matters when you’re doing the installation. It was around 55F when I started in the evening, and when it dipped down into the 40s the sheets would not stick to the metal, and were hard to compress with the roller. That’s why I ended up only doing the floors and not any vertical surfaces; i will have to wait for a nice hot day. The other thing is that the foil layer on top is razor sharp at the edges, definitely wear gloves! I didn’t notice until after but I have little papercuts all over my fingers. Aside from those things, the install was easy and straightforward. The sheets cut easily with scissors, and any goo that ends up on your hands or scissors can be cleaned up with acetone (nail polish remover), or lacquer thinner. I would use this stuff again.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on November 16, 2023
            L
            Verified Purchase
            Lyrah
            Belleville, US
            ★★★★★ 5
            Very efficient!
            Model: NewSLS50_52
            Amazing the difference it makes on dumping the noise. Very easy to install. Pell and stick literally! Great!
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on November 23, 2025
            C
            Verified Purchase
            Chuck J
            Houston, US
            ★★★★★ 5
            Awesome filter! Nasty campground water no longer...
            Style: Standard Filter
            I have run these for years in my RV and they work killer! Here's some more in-depth thoughts: Pros: - These work better than I had expected. Just hook them up to the water source, hook your hose to it, run it to your trailer and viola` clean and good tasting water. Some of the places we have visited have had water that I wouldn't feed to my worst enemy. With this thing attached, it's very good tasting. - I like the hose attachment that comes with this to aide in adding flexibility to the system and not put too much strain on the system. I have bought so many of these, I now use one attaching the filter to the nozzle, one out of the filter to my hose, and one attaching my hose to the trailer. Notes: - I will note that the manufacturer suggesting using these for only 1 camping season, and this makes sense. That's what I do, and it seems to work out great. It's not too much $ to replace every season. - Another note, when first putting this filter into service (just the first time of the season, subsequent hook-ups wont do this) there will be a bunch of carbon (black in the water) that comes out of the faucet in your trailer. This is perfectly fine, safe, and of no issue. This is the filter breaking in and getting the extra carbon out of the system. There is no health concern with this happening. I just run the faucet until it clears up, and then we're good to go for the rest of the season. - Last note, when we unhook from our camping spot, I swing the filter in my hand with my arm extended (using centrifugal force, not centrifical, look it up) to get the residual water out of the filter so it doesn't sit in there and spoil. I do this until I get most of the water drops to stop, leave it out on the counter to dry, and boom, it's perfect the next time. Cons: - None to report Overall this filter does a great job taking care of some seriously nasty campground water that we've encountered all over the Southwest US. I cannot recommend it any higher. I hope I have helped your purchasing decision of this product. I am not affiliated with the manufacturer, seller or any other product related company nor am I under any obligation to write this review. I do this for my own fun and to help others in the Amazon Community! Feel free to comment and let me know if I have helped you, and please note below if this review was able to help. If you should have any questions, please post them below in the Comments. I try to answer all inquires in a timely fashion to the best of my ability.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on April 26, 2017
            M
            Verified Purchase
            Mark H. in the Garage
            Natrona Heights, US
            ★★★★★ 5
            Clean, Great-Tasting Water Made Easy with Camco Tastepure
            Style: Standard Filter
            I installed the Camco Tastepure RV inline water filter on our rig, and it’s another example of why I’ve come to trust Camco products. The reinforced strain relief hose is a small but incredibly smart feature—it keeps the connection between the filter, hose, and RV kink-free and easy to manage. Setup was simple, and the whole system feels sturdy and well-designed. A tip I’ve learned through experience: before putting a new filter into service, run water through the internal charcoal filter for 30 - 45 seconds. This flushes out any loose charcoal bits and ensures the first water you drink is crystal clean and tastes amazing. After that, connecting to the RV is straightforward, and you immediately notice how much better the water tastes. Whether filling up a glass or cooking, it’s made a real difference in our RV experience. Reliable, easy to use, and excellent tasting water every time - I highly recommend this to any RV owner who cares about water quality on the road.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on January 10, 2026

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