SKU: 51818577235

B58 BMW/Supra BMS Oil Catch Can Oil Filler Cap Dual Vent Connection Kit

Sale price$175.14 Regular price$194.60
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Description

B58 BMW/Supra BMS Oil Catch Can Oil Filler Cap Dual Vent Connection KitUpgrade Your B58 Catch Can System with a True Dual Vent Solution For use with BMS Oil Catch Can for G Chassis Gen 2 B58 BMW M240 M340 M440 BMS Oil Catch Can for 2020+ B58 Toyota Supra GR MK5 BMS Oil Catch Can for G Chassis Gen 3 2025+ B58 BMW M340 M440 Take your B58 BMW or Supras crankcase ventilation performance to the next level with the BMS Oil Filler Cap Dual Vent Connection Kit = the missing link for ultimate catch can and engine efficiency. This


Upgrade Your B58 Catch Can System with a True Dual-Vent Solution

For use with 

BMS Oil Catch Can for G Chassis Gen 2 B58 BMW M240 M340 M440

BMS Oil Catch Can for 2020+ B58 Toyota Supra GR MK5

BMS Oil Catch Can for G Chassis Gen 3 2025+ B58 BMW M340 M440


Take your B58 BMW or Supra’s crankcase ventilation performance to the next level with the BMS Oil Filler Cap Dual Vent Connection Kit = the missing link for ultimate catch can and engine efficiency. 

This precision-machined billet cap replaces the factory oil filler cap and creates a second dedicated exit point for dirty PCV gases. That means both the crankcase vent and the valve cover breather can now be routed into your oil catch can. Twice the inputs into your catch can means twice the oil vapor capture, keeping harmful oil mist out of your intake tract. Cleaner air, cleaner intake valves, and a more efficient PCV system, more efficient engine, it’s a simple upgrade with major payoffs. 

Why This Matters:

  • Double the Captured Flow: Adds a second breather port for PCV/vapor extraction so you pull more blow-by gasses into your catch can.

  • Reduces Piston Resistance: This creates a slight negative pressure (vacuum) in the crankcase, reducing the resistance the pistons face as they move, improving fuel economy and performance.

  • Manages Pressure: "Blow-by" gases (unburned fuel, air, combustion byproducts) get past piston rings into the crankcase, creating pressure.

  • Cleaner Combustion Air: Reduces oil vapor recirculation that leads to intake valve carbon buildup. 

  • Maximized Catch Can Efficiency: Works with the BMS catch can to let it do more of its job. 

  • Perfect For: Anyone running a B58 BMS oil catch can looking to squeeze every bit of performance and protection from their PCV system, especially on tuned or high-boost builds.

  • Precision-Built Fit: CNC billet aluminum construction replaces the factory filler cap for a secure, purposeful connection. 

  • All Hardware Included: Includes billet cap, AN fittings, high-temp hose, T-fitting, and clamps for a clean install. 

What's Included:
(1) BMS B58 BMW Billet Oil Filler Breather Cap 
(1)
-12ORB 90º to -12AN fitting
(1)-12 AN barbed straight Fitting
(1) Heavy-duty custom silicone hose
(1) Barbed PCV T- fitting
(3) Hose clamps

⚠️ ATTENTION: This installs differently than the OEM oil filler cap. To install, line the grooves up with the tabs on the filler neck on the car, push all the way down and twist down tightly. Be sure they cap is seated and tightly sealed before use to prevent leaks. 

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: 51818577235

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4.9 ★★★★★
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DarthVaderVan
Grantham, US
★★★★★ 5
Great Quality, Great Price.
Color: Black
I have used this for a few days now and it works great. It is very well made and has a large range of adjustability. It is quite small and easy to store. Definitely worth the money.
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Reviewed in the United States on May 6, 2026
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Claude Figueroa
Cuba, US
★★★★★ 5
Nice Grinder at a Great Price
Color: Black
I bought this to use primarily as a travel grinder and found that it is great for every day use. It is not meant for large amounts but it is perfect for single, smaller brewing situations. The grind selection worked well and I "dialed" the proper ground size for my single sized pour over coffee maker.
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Reviewed in the United States on May 19, 2026
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Karin Conover-Lewis
Lexington, US
★★★★★ 1
Ceramic burr destroyed itself
Color: Silver
For the first two-plus months it worked fine -- the perfect grind and the perfect amount with a full barrel for my oversized coffee mug. I've been using it once daily, more or less, on a medium grind setting of 25, and this morning the ceramic burr started to eat itself. This is not acceptable. Follow up: Circle Joy contacted me and offered to give a full refund on this purchase, which was gratefully accepted. This is outstanding customer service.
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Reviewed in the United States on April 28, 2026
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Brian
Lowell, US
★★★★★ 5
Best price for better tasting coffee
Color: Silver
I am a coffee snob. I only get beans. I have been using a magic bullet blender to grind, which actually does extremely well, but the grind wasn't quite even enough. So I found the cheapest, ok quality grinder I could and bought this one. I absolutely love it. It take a while to grind, and it only does a little at once, but whatever. This thing works great and my grounds are now even. The burrs seem to be of decent quality and the whole device works smoothly.
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Reviewed in the United States on February 18, 2026
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happycurls
Cuba, US
★★★★★ 5
Reliable favorite kitchen tool
Color: Blue
This wonderful tool may be the most used tool in our kitchen. The hardest thing about it is to remember you can push the button and it runs- you don't have to hold it!. The charge on the rechargable battery last a long time- about 1 recharge per month- and we use it daily. We use the mixer attachment most. It works great for protein powders, collagen, iced tea or lemonade mix. It cleans easily and is waterproof- just make sure the cover is over the charging port. We have used it to froth milk, whip eggs, and as I said we use it daily to mix beverages. I worried about the price, but it is a great value because we bought it in December 2024 and it is more powerful and has already lasted longer than two whimpy ones.
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Reviewed in the United States on October 28, 2025

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