You Should be using BMW only brand , as a Dorman brand will leave you stranded every couple years .
Pros: BMW: reliable
Cons: Dorman: unreliable, leaves stranded
Reviews of DORMAN expansion tank
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10 votes
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I purchased a new expansion tank for my BMW e46. Initially, I opted for a Dorman expansion tank from AutoZone, but I wasn’t entirely convinced by my choice. Unfortunately, I observed that the AutoZone tank was leaking from the top, which left me puzzled. I wondered if this issue was due to it being an aftermarket part. This year alone, I’ve had to replace the tank five times, which has been quite frustrating.
Cons: leaking from top, frequent replacement
Vehicle:
BMW
i’m still rolling with a dorman expansion tank just because it was the only thing available on hand when the original one failed, no leaks yet
Pros: no leaks
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What we know about DORMAN expansion tank
The brand is registered in USA. Official website: https://www.dormanproducts.com.
In March 2026, PartReview does not yet have a formed opinion of DORMAN expansion tank. You can help by adding a review for DORMAN expansion tank.
Currently there are 3 reviews and 10 votes. Average rating — 1.8 out of 5. Vote balance: 2 up, 8 down.
Users also evaluated the qualities of DORMAN expansion tank:
- Level visibility - coolant level is easy to see and read - no rating yet
- No leaks - cap and seams stay dry - rated negatively. 1.8 point out of 5.
- No coolant smell - no sweet odor around the engine bay - no rating yet
Expansion tank DORMAN in car-specific ratings
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