BMW 17117573781 - Coolant Expansion Tank for E46 E83 E53
by BMW
Key Features
- Genuine BMW expansion tank, part number 17117573781
- Fits select E46, E83, and E53 models
- Direct replacement for cracked or aging factory reservoir
- Works with factory coolant level sensor setup
- Common failure point after repeated heat cycles
- Best replaced during full cooling system refresh
Product Details
- Brand
- BMW
- Category
- Expansion Tanks
- ASIN
- B009CCHT3S
BMW 17117573781 - Coolant Expansion Tank for E46 E83 E53 — Overview
This is a genuine BMW coolant expansion tank, part number 17117573781, for E46 3 Series, E83 X3, and E53 X5 applications. On these chassis, the tank is a known weak point once the plastic has gone through enough heat cycles. They usually crack at the seams, around hose connections, or near the level sensor area, and by then you're already dealing with coolant loss.
I'd pick the genuine BMW tank here over a bargain aftermarket one because these tanks need to seal correctly, fit the brackets properly, and work with the factory level sensor setup without drama. If you're refreshing an older cooling system, this is one of those parts worth doing right the first time. It also makes sense as preventative maintenance if you see discoloration, stress marks, or dried coolant residue on the original tank.
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