


BFI MK4 1.8T Crankcase Breather Adapter
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
BFI MK4 1.8T Crankcase Breather AdapterDesigned to fit into the stock location for the crankcase breathing system located on the oil filter housing. This adapter gives you the ability to install either braided, nylon, or push lock hoses to replace your existing factory ones. Threaded for a 10 ORB fitting this adapter gives you a world of options! Each adapter includes a brand new OE gasket. *90 fitting not include*
Quick Dispatch:
Your BFI MK4 1.8T Crankcase Breather Adapter orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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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]
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4.0 ★★★★★
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Product Reviews
★★★★★ 5
Noticeable scent difference compared to factory standard
Smells clean for months. We are mainly gravel roads and these cabin filters do a great job
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 3, 2026
★★★★★ 5
It fits perfectly.
Great replacement and a very good price.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
Nice and a good price.
Fit our F250 Diesel well.
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Reviewed in the United States on November 10, 2025
★★★★★ 5
Great fitment
Nice fitment
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Reviewed in the United States on December 15, 2025
★★★★★ 2
F250 cabin filter change
Too thick. Air flow decreased significantly which is terrible in the AZ heat!
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Reviewed in the United States on July 27, 2025