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
PR Score
?
Shows the percentage of positive votes. Learn more about the score in the help
10 votes
Average rating
?
The average rating is calculated based only on review ratings, excluding votes
Description
Share on social networks:
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
Write your review about expansion tank DORMAN
Help others - share your experience with this part.
Other expansion tank
Popular spare parts DORMAN
Voted AGAINST engine oil RAVENOL on the rating page
The brake pads OEM Alfa Romeo got the first review!
The brake caliper OEM BMW got the first review!
The brake pads OEM Infiniti got the first review!
For wiper blades PIAA already 100 reviews.
For battery Energizer already 25 reviews.
In the rating best water pump already 12 brands participate!
In the rating best timing belt already 13 brands participate!
In the rating best head gasket already 3 brands participate!
In the auto rating oil filter for Volkswagen Passat already 5 brands participate!
In the auto rating brake pads for Mazda 5 already 10 brands participate!
In the auto rating tires for Subaru Outback already 50 brands participate!
For cabin filter Fram already 25 reviews.
Voted AGAINST engine oil RED LINE on the rating page
Voted AGAINST engine oil PENNZOIL on the rating page
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
Unfortunately, there are no car-specific ratings for this part yet. You can help by adding a review and specifying your car.