CNPUERV Aluminum Coolant Expansion Tank — G30/G32/G14/G15/G16
by CNPUERV
Key Features
- Cast aluminum ASTM B 85-03 384 alloy construction — not plastic like the OEM unit
- Rated for 200,000 pressure cycles at 35 PSI; 100 PSI burst pressure threshold
- Direct OEM replacement — no modifications required, hose connections are plug-and-play
- Fits G30 5 Series, G32 Gran Turismo, and G14/G15/G16 8 Series (2016–2023)
- Includes pressure-matched cap to maintain system pressure and prevent coolant boil-off
- Every unit pressure and leak tested before shipping; backed by 60-month warranty
Product Details
- Brand
- CNPUERV
- Part #
- 17138610656
- Category
- Expansion Tanks
- ASIN
- B0FSDVS3XK
Check if it fits your BMW
CNPUERV Aluminum Coolant Expansion Tank — G30/G32/G14/G15/G16 — Overview
The factory plastic coolant reservoir on G-chassis BMWs has a well-documented reputation for cracking under prolonged heat cycling and pressure stress — it's a maintenance item, not an if, but a when. The CNPUERV aluminum expansion tank eliminates that vulnerability by replacing the entire housing with a casting built to ASTM B 85-03 384 specification, the same alloy standard applied in demanding high-heat thermal applications. This isn't a cosmetic upgrade; it's a structural one.
The engineering specs back it up. This tank is validated to endure 200,000 pressure cycles at 35 PSI operating pressure and carries a burst rating of 100 PSI — margins that far exceed what the OEM plastic unit is capable of sustaining over time. Whether you're running hard on a track day or simply dealing with the heat soak of a turbocharged inline-six in stop-and-go traffic, the aluminum construction resists deformation, aging, and impact in ways the original part simply cannot.
Fitment covers a broad range of G-platform models: the G30 5 Series (530e, 530i, 540i in rear- and all-wheel-drive variants), the G32 Gran Turismo 640i xDrive, and the G14/G15/G16 8 Series (840i and 840i xDrive Gran Coupe through 2023), along with select G11/G12 7 Series applications. Installation is a straightforward swap — remove the old tank, disconnect the hose lines, install the new unit, and reconnect. No drilling, no adapters, no shop required. Cross-reference OEM numbers 17138610656, 17138742975, 17139487210, or 17139884859 to confirm your application before ordering.
Every unit ships only after passing individual pressure and leak testing at the factory. The included cap is pressure-matched to the system, maintaining the precise operating pressure needed to prevent coolant boil-off and keep your engine thermally stable. A 60-month warranty covers the purchase — longer coverage than most OEM components offer, and on a part built to outlast them.
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