SKU: 21942443579

BMW B58 / S58 Billet Engine Fluid Cap Set

Sale price$121.50 Regular price$135.00
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Ships within 48 hours · Estimated delivery Aug 7 - Aug 12

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Description

BMW B58 / S58 Billet Engine Fluid Cap SetBundle and SAVE! Choose your color combo to dress up your engine bay! The Precision Raceworks Billet Engine Cap Set is a functional and stunningly stylish way to add a nice touch to any engine bay! These caps 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.

Bundle and SAVE! Choose your color combo to dress up your engine bay!

The Precision Raceworks Billet Engine Cap Set is a functional and stunningly stylish way to add a nice touch to any engine bay!

These caps 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 replace the factory cap not just cover it up. The 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: 1.1 lbs
  • Material type: Anodized Aluminum
  • O-Ring Material: Viton
  • Retains OEM Pressure Relief: YES

      Fitments

      • Bmw M3 2021 to 2024
      • Bmw M340i Sedan 2019 to 2024
      • Bmw M340ix Sedan 2019 to 2024
      • Bmw M4 2021 to 2024
      • Bmw M440i 2021 to 2024
      • Bmw M440ix 2021 to 2024
      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: 21942443579

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      Live to read
      Lexington, US
      ★★★★★ 5
      Pretty good, especially for this price point.
      Color: Beige, Size: 21.5"- 1 Panel
      This is merely a piece of cloth stretched between the frame borders, but it works perfectly. It arrived quickly, all parts present and in good condition. I didn't put the castors on, as it will be more or less always in one position. I simply attached some felt sliders on the bottom to prevent scratching the floor and to allow clearance for the center screw (which is not flush fit). Overall, a reasonable deal for the price point.
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      Reviewed in the United States on May 30, 2026
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      melissa mcpherson
      Los Angeles, US
      ★★★★★ 5
      Easy to manage
      Color: Black, Size: 88"- 4 Panel
      Sturdy, easy to manage and roll around. The material for the walls is of a decent ply as well
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on May 24, 2026
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      Samson Yu
      Whiting, US
      ★★★★★ 4
      Great product!
      Color: Beige, Size: 88"- 4 Panel
      Worked well and it was easy to roll around and fold. The size is great and has a good weight to it. Very sturdy, I plan to buy more
      WAS THIS REVIEW HELPFUL?YesReportShare
      Reviewed in the United States on February 10, 2026
      J
      Verified Purchase
      J.K.
      Bozeman, US
      ★★★★★ 5
      Wonderful Room Partition !
      Color: Black, Size: 88"- 4 Panel
      This product is made very well, packaged, and assembled with no problems. All parts and tools are included (except a Phillips screwdriver.) I put this item all together by myself on a bed to make it easy and simple. I made sure that every screw head was attached where the recessed dimples are located on the vertical poles, just don't overtighten anything. Everything fits like a charm, good quality, looks great, perfect height, rolls with ease, proper privacy, really impressive ! I got the 4-panel in black color. I would certainly buy this item again ! Thank you !
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      Reviewed in the United States on September 26, 2025
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      Amazon Customer
      Birmingham, US
      ★★★★★ 1
      Not impressed
      Color: Beige, Size: 21.5"- 1 Panel
      Very flimsy but does the job intended
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      Reviewed in the United States on May 27, 2026

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