SKU: 73327422072

BMW Auxiliary Coolant Reservoir Cap

$85.49 $94.99
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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

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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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            4.8 ★★★★★
            Based on 25 reviews
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            Verified Purchase
            Debra
            Whiting, US
            ★★★★★ 4
            Not for small animals
            I bought these for my ferret and even though it’s hard for her to pick up, they’re so cute and soft.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on February 19, 2026
            S
            Verified Purchase
            Shae Ra
            Lowell, US
            ★★★★★ 5
            Squeaker Shenanigans!
            I have four large dogs - 65-70 lbs, pittie babies. Three out of four love, love, LOVE squeaker toys. You can't keep a squeaker toy in my house to save your life. If it squeaks, it dies a quick squeaker death. We generally buy squeak toys at the Dollar Store. My going theory on toys is it has to last one minute per dollar I spend on it. Then I call it "worth the money." Right now, it is winter and where I live, so very cold. My kids can't get all their energy out by being outside, so we have to come up with creative indoor fun. I like these types of packs of toys, one for the value and two the quantity. I put all the toys in a box, and then my kids get to come up and pick one out of the box - they then run off for the squeaker toy of destruction fun! Squeak! Squeak! Squeak! Death. One kids goes right to hunting for where the squeaker is inside the toy, and the hunkers down to figure out how to get it out and kill it. She is usually the 60 seconds or less, 1st Place Squeaker Death Winner. The other two, will take their time and enjoy the squeaks and work the squeaker out until death finally takes it. My 70 lb boy, is kind of a baby, and after he neatly gets his squeaker out, he makes the toy his baby, and then carries it around proudly. Considering how large my kids are, these are well made and take the full minute for Squeaker of Death girl to get the squeaker out. The size is great, even for my larger dogs. I got nine toys for about $12 at the time of this purchase, and it was perfect. It did come with the storage bag...but not something that is necessary in this house. Although, it was actually quite nice, and I am sure I can use for something else. The Sun was a big hit, and despite not having its squeaker anymore, is still hanging around, days later. I will be buying this pack again.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on December 21, 2025
            N
            Verified Purchase
            NT
            Lowell, US
            ★★★★★ 5
            Pom approved!
            My pomeranian ONLY plays with small stuffies that squeak. She loves these and they are just small enough for her to hold and squeak. They are durable enough - but we will see when her big dog cousins come play with her, just how sturdy they are! They are very cute, soft, and squeak well. Good value for the pack of them.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on December 2, 2025
            T
            Verified Purchase
            Tyler Durden
            Lexington, US
            ★★★★★ 5
            Goldilocks of dog toys!
            We recently rescued a small/medium bulldog breed (35lbs) and she *loves* toys. Problem was that our other dog's (75lbs) toys were too big. They literally were the size of her. We found that our new baby pooch was constantly raiding our cat's bed with the cat toys. They were more her size and she knew it. I bought her some cat toys (mostly mice with catnip inside and a yarn tail). She *loved* them, but they were too small. She would choke on them and I would literally have to pull them out of her throat by the mouse tail. Scared us too much so we gave (all 20) away to a friend. I scoured Amazon and found these whimsical toys and they are *JUST RIGHT*! Perfect size, have held up several days of chewing and gnawing, squeak pretty well, and my big dog also loves them! These deserve the 4.9 (5.0 but can't please everyone) rating that lead me to purchase them in the first place. Buy with confidence for your medium size (or any size really) fur baby!
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on February 4, 2026
            H
            Verified Purchase
            HandR
            New York, US
            ★★★★★ 5
            Super Cute!!
            These adorable toys are incredibly cute! My 9-week-old puppy absolutely loves them. There are so many different options that I can easily rotate them to keep him entertained and prevent boredom. So far, they have held up well against his teething, and I've even needed to wash a few of them in my washing machine due to potty training. They are perfect for small dogs and puppies and offer great value for the price.
            WAS THIS REVIEW HELPFUL?YesReportShare
            Reviewed in the United States on April 28, 2026

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