Genuine BMW is best, luckily the genuine caps are affordable
Pros: best, affordable
Vehicle:
BMW
Owner reviews for expansion tank cap
Manufacturers
I found out that he best caps for bmw are made by Vernet.
Pros: best caps
Vehicle:
BMW
Oem 2.0 bar expansion tank cap is a liability to the cooling system usually resulting in catastrophic failures. I'm using the now recommended 1.4 bar cap, less chance of ruptured hoses & tanks. Bmw now recommends the 1.4 bar! And better peace of mind
Pros: less chance of ruptures, better peace of mind
Cons: liability, catastrophic failures
Vehicle:
BMW
Those leaks on your VW... looks to be the expansion tank cap not functioning properly...
Cons: cap not functioning properly
i got a mahle premium line cap which instantly broke on me not releasing air causing the hoses to get squished, put on the old one and that fixed it.
Cons: instantly broke, hoses squished
They sent my friend a cap for a non-m car and it took him a while to figure out the leak was from the brand new cap.
Cons: incorrect cap, caused leak
Vehicle:
BMW
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Owner reviews for expansion tank cap
As of March 2026, PartReview has 6 reviews across 5 manufacturers for expansion tank cap. 5 of them have enough reviews to participate in the ranking of this part.
Popular manufacturers of expansion tank cap
The most popular manufacturers of expansion tank cap on PartReview include:
- OEM BMW - 2 reviews. PR Score: not available yet, average rating: 4.5.
- MISHIMOTO - 1 review. PR Score: not available yet, average rating: 1.0.
- Vernet - 1 review. PR Score: not available yet, average rating: 5.0.
- Mahle - 1 review. PR Score: not available yet, average rating: 1.0.
- OEM Volkswagen - 1 review. PR Score: not available yet, average rating: 3.0.
Most opinions about performance and characteristics of expansion tank cap are collected on these pages.
Top manufacturers of expansion tank cap
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Comparisons of expansion tank cap manufacturers
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