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BMW Expansion Tank - Mahle Behr 17111723520
BMW Expansion Tank - Mahle Behr 17111723520
BMW Expansion Tank - Mahle Behr 17111723520
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BMW Expansion Tank - Mahle Behr 17111723520

Brand: Mahle SKU: MAH-CRT51000S
$277.37 CAD $169.00 CAD
Ships in 3–4 days

Estimated Delivery: Oct 25, 2026 - Oct 31, 2026

Ships from our Montréal Hub For faster delivery across Canada

BMW Expansion Tank - Genuine BMW 17111723520
BMW Expansion Tank - Genuine BMW 17111723520
$329.00 $299.00
BMW Aluminum Thermostat Housing - URO Parts 11531722531
BMW Aluminum Thermostat Housing - URO Parts 11531722531
$92.52 $44.00

Details

SKU: MAH-CRT51000S
GTIN / UPC: 04045621277444
Made in: China
Quality: OEM

OE Numbers

17111723520

MFG Numbers

CRT51000S, 376705401, 376.705.401-8MA

Product Information

MAHLE aftermarket engine coolant expansion tank designed as a direct replacement for compatible BMW cooling systems. The reservoir provides space for coolant to expand as operating temperature and system pressure increase, then allows coolant to return to the cooling circuit as the system cools.

Expansion tanks are exposed to continuous heat cycles, pressure and coolant chemicals, which can cause the plastic to become brittle, discolored or cracked over time. A failing reservoir may develop slow seepage or sudden coolant loss, which can reduce cooling system pressure and contribute to overheating.

Replacing an aging or leaking expansion tank helps restore proper coolant storage, system pressure and cooling system reliability. Replacement is also worth considering during major cooling system service or radiator replacement on higher-mileage vehicles.

Important: Coolant level sensor and reservoir cap are not included.

About Mahle

Mahle stands at the forefront of automotive engineering, developing advanced engine, filtration, and thermal management solutions for vehicles worldwide. With a heritage dating back to 1920, Mahle is a primary OE supplier to global manufacturers including BMW, Mercedes-Benz, Audi, VW, Porsche, and more. Renowned for their innovation, Mahle’s product range covers oil filters, air filters, pistons, engine parts, thermostats, and cooling systems—all produced to exacting standards for optimum efficiency and reliability. Mahle’s aftermarket products are identical in quality to original equipment, guaranteeing the same level of performance and longevity found in new vehicles. Rely on Mahle for precision, longevity, and German engineering trusted by professionals and enthusiasts alike.

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Check the fitment details and any requirements before ordering.

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Not sure if it fits? Contact us with your VIN or vehicle details.

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Find quick answers to common product, ordering, shipping, returns, warranty, and support questions.

GEMS autocraft offers quality auto parts, performance upgrades, accessories, maintenance services, retrofit solutions, and advanced coding support for a wide range of vehicles.

Returns are accepted within 30 days of delivery, provided the item is unused, in its original packaging, and in resellable condition. For complete details, please see our Return Policy.

Yes, we ship worldwide. Orders are packed carefully and overboxed when needed to help ensure they arrive safely.

Yes. Once your order has shipped, you will receive a tracking number by email. You can also check your order status anytime through your customer account under the Orders section.

We accept major credit cards, PayPal, Apple Pay, Google Pay, Shop Pay, e-Transfer, and Wise to offer a secure checkout experience.

Need help with something else? Contact us and our support team will be happy to assist.

We stand behind every product and service we offer.
Our return and warranty process is clear, fair, and efficient, so each request can be reviewed properly and handled with care.

Returns
Return Window Returns must be requested within 30 days of delivery.
Item Condition Items must be unused, complete, in their original packaging, and in resellable condition.
Final Sale Items Electrical components, Starlink products, fluids, lubricants, used parts, custom orders, special orders, and gift cards are final sale.
Warranty Coverage
Product Warranty Manufacturer's applicable warranties are honored on all products, typically ranging from 1 to 5 years depending on the brand and product.
Service Warranty Repair, rebuild, and installation services are covered by a 1 year workmanship warranty.
Installed Parts When parts are supplied and installed by GEMS autocraft, eligible warranty claims cover both the part and the workmanship.
Claims & Processing
Claim Requirements Please provide your order number, product details, a clear description of the issue, and photos when applicable.
Refund Processing Once received, inspected, and approved, refunds are issued to the original payment method within 3 to 5 business days.
Return Shipping Return shipping and insurance are the customer’s responsibility unless the return is approved as part of an eligible warranty claim.

Warranty coverage may vary by product, brand, service type, and condition. For complete terms, exclusions, and examples, please read the full Return and Warranty Policy.

Submit Return Request Submit Warranty Claim

GEMS Guard™ gives you long-term confidence across the products and services we support.
It combines lifetime protection on GEMS autocraft branded parts, honored manufacturer warranties, and a 1 year workmanship warranty on services performed by GEMS autocraft.

Product Protection
GEMS Branded Parts All GEMS autocraft branded products are protected by our GEMS Guard™ Lifetime Warranty.
Manufacturer Warranty Support Manufacturer's applicable warranties are honored on all eligible products, typically ranging from 1 to 5 years depending on the brand and product.
Built With Accountability Whether it carries the GEMS name or is supported through the original manufacturer, our team helps review eligible claims and guide the warranty process properly.
Service Protection
Repair and Rebuild Services All repair and rebuild services performed by GEMS autocraft are backed by a 1 year workmanship warranty on the work completed.
Professional Installation Installation work completed by GEMS autocraft is covered for 1 year from the completion date, giving you confidence that the work was performed with care and accountability.
Supplied and Installed by GEMS When a covered part is both supplied and installed by GEMS autocraft, eligible claims cover the part and the workmanship together during the applicable warranty period.
How Claims Work
Simple Review Our team reviews each claim directly to confirm product eligibility, warranty type, issue details, and the best next step.
Required Details Please provide your order number, product details, a clear description of the issue, and photos or diagnostic information when applicable.
Fair Resolution Once approved, we will help resolve the claim as efficiently as possible through repair, replacement, store credit, manufacturer support, or another appropriate warranty solution.

Coverage does not apply to misuse, improper installation, modification, abuse, neglect, or damage caused by unrelated vehicle issues. Warranty coverage may vary by product, brand, service type, and condition. For complete terms, please read the full Return and Warranty Policy.

Submit Warranty Claim Contact Support

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