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Rein CPE0035 - Engine Coolant Reservoir Cap
Product Overview
The Rein Engine Coolant Reservoir Cap CPE0035 is an essential component for maintaining the performance of your BMW's cooling system. Designed for durability and reliability, this premium-grade cap is engineered to OEM standards and is a direct replacement for part number 17 11 7 639 020, ensuring a perfect fit and optimal performance. Manufactured from high-quality materials, the Rein coolant reservoir cap withstands high temperatures and pressure, effectively preventing coolant leaks and ensuring your engine stays cool. Its easy installation means you can replace your old or damaged cap without any modifications, allowing your vehicle to maintain its peak performance. Choose Rein CPE0035 for dependable performance and peace of mind every time you service your vehicle.
Cross Reference Numbers
This Rein CPE0035 is equivalent to or replaces the following part numbers: 17 11 7 639 020, 17117639020.
Vehicle Compatibility
- BMW 840i Gran Coupe 3.0L6 (2020–2021)
- BMW 840i xDrive Gran Coupe 3.0L6 (2020–2021)
- BMW X7 3.0L6 (2020–2021)
- BMW X4 M Competition 3.0L6 (2020–2021)
- BMW X4 M40i 3.0L6 (2020–2021)
- BMW X3 M40i 3.0L6 (2020–2021)
- BMW X3 M Competition 3.0L6 (2020–2021)
- BMW X3 xDrive30i 2.0L4 (2020–2021)
- BMW X6 xDrive40i 3.0L6 (2020–2021)
- BMW 740i 3.0L6 (2020–2021)
This may also fit other applications. Please use the vehicle selector tool to verify fitment.
Why Shop at eEuroparts.com?
- Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
- Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
- Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
- Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
- Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
- Established Trust: Serving the European auto community since 2000.
Frequently Asked Questions
What does the Rein CPE0035 Engine Coolant Reservoir Cap do?
The Rein Engine Coolant Reservoir Cap is designed to seal the coolant reservoir, maintaining the proper pressure within the cooling system and preventing coolant leaks. This ensures efficient engine cooling, protecting your vehicle from overheating.
How do I know if my Engine Coolant Reservoir Cap needs replacement?
Common signs that the coolant reservoir cap may need replacement include visible coolant leaks, a cracked or damaged cap, high engine temperature, or warning lights indicating overheating.
Can I install the Rein CPE0035 myself?
Yes, the installation of the Rein CPE0035 is straightforward and can be done by most DIY enthusiasts. Ensure you follow proper safety precautions and consult your vehicle's manual for specific instructions.
What are the symptoms of a faulty Engine Coolant Reservoir Cap?
Symptoms of a faulty coolant reservoir cap may include coolant leaks, fluctuating engine temperatures, and the activation of the engine temperature warning light. These issues can lead to overheating if not addressed promptly.
Why should I choose Rein for my Engine Coolant Reservoir Cap needs?
Rein is trusted for its high-quality automotive components, ensuring reliable performance and fitment. Order Rein CPE0035 today for a factory-correct replacement that restores safety and performance.
Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.
- BrandRein
- ManufacturerRein
- MPNCPE0035
- Part TypeEngine Coolant Reservoir Cap
- OE Part Numbers17 11 7 639 020, 17117639020
- FeaturesApplication Type : Application Specific
Bullet Point 1 : Manufactured to strict engineering standards/specifications in materials and tolerances.
Bullet Point 2 : Direct fit.
Bullet Point 3 : Meets or exceeds pressure specifications demanded by the OE manufacturer.
Bullet Point 4 : Produced by an original equipment supplier.
Container Type : BG
Country of Origin : DE
Item Height : 2.2500
Item Length : 3.5000
Item Level GTIN : 843266070628
Item Qty : 1
Item Quantity Size : 1
Item Quantity Size UOM : EA
Item UOM : EA
Item Weight : 0.1650
Item Weight Unit UOM : LB
Item Width : 3.7500
Link to Manufacturer Page : www.reinautomotive.com
Product Desc Extended 240 : Rein OE Quality expansion tank caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life.
Product Desc Invoice 40 : Rein Expansion Tank Cap
Product Desc Long 80 : Rein OE Quality Expansion Tank Cap
Product Desc Short 20 : Expansion Tank Cap
- Fitment
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2020 | BMW | X5 | sDrive40i (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | X5 | xDrive40i (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | 740i | Base (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | 740i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | 540i | Base (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | 540i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | 530i | Base (2.0 L4 GAS) | Position: Radiator |
| 2020 | BMW | 530i xDrive | Base (2.0 L4 GAS) | Position: Radiator |
| 2020 | BMW | X3 | sDrive30i (2.0 L4 GAS) | Position: Radiator |
| 2020 | BMW | X3 | xDrive30e (2.0 L4 PHEV) | Position: Radiator |
| 2020 | BMW | X3 | xDrive30i (2.0 L4 GAS) | Position: Radiator |
| 2020 | BMW | X3 | M (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | X3 | M Competition (3.0 L6 GAS) | Position: Radiator |
| 2020 | BMW | X3 | M40i (3.0 L6 GAS) | Position: Radiator |
| 2019 | BMW | X5 | xDrive40i (3.0 L6 GAS) | Position: Radiator |
| 2019 | BMW | 740i | Base (3.0 L6 GAS) | Position: Radiator |
| 2019 | BMW | 740i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2019 | BMW | 540i | Base (3.0 L6 GAS) | Position: Radiator |
| 2019 | BMW | 540i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2019 | BMW | 530i | Base (2.0 L4 GAS) | Position: Radiator |
| 2019 | BMW | 530i xDrive | Base (2.0 L4 GAS) | Position: Radiator |
| 2019 | BMW | X3 | sDrive30i (2.0 L4 GAS) | Position: Radiator |
| 2019 | BMW | X3 | xDrive30i (2.0 L4 GAS) | Position: Radiator |
| 2019 | BMW | X3 | M40i (3.0 L6 GAS) | Position: Radiator |
| 2018 | BMW | X5 | xDrive40e (2.0 L4 PHEV) | Position: Radiator |
| 2018 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2018 | BMW | X5 | sDrive35i (3.0 L6 GAS) | |
| 2018 | BMW | X5 | xDrive35i (3.0 L6 GAS) | |
| 2018 | BMW | X5 | xDrive50i (4.4 V8 GAS) | Position: Radiator |
| 2018 | BMW | 740i | Base (3.0 L6 GAS) | Position: Radiator |
| 2018 | BMW | 740i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2018 | BMW | 540i | Base (3.0 L6 GAS) | Position: Radiator |
| 2018 | BMW | 540i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2018 | BMW | 530i | Base (2.0 L4 GAS) | Position: Radiator |
| 2018 | BMW | 530i xDrive | Base (2.0 L4 GAS) | Position: Radiator |
| 2018 | BMW | X3 | xDrive30i (2.0 L4 GAS) | Position: Radiator |
| 2018 | BMW | X3 | M40i (3.0 L6 GAS) | Position: Radiator |
| 2017 | BMW | X5 | xDrive40e (2.0 L4 PHEV) | Position: Radiator |
| 2017 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2017 | BMW | X5 | sDrive35i (3.0 L6 GAS) | |
| 2017 | BMW | X5 | xDrive35i (3.0 L6 GAS) | |
| 2017 | BMW | X5 | xDrive50i (4.4 V8 GAS) | Position: Radiator |
| 2017 | BMW | 740i | Base (3.0 L6 GAS) | Position: Radiator |
| 2017 | BMW | 740i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2017 | BMW | 540i | Base (3.0 L6 GAS) | Position: Radiator |
| 2017 | BMW | 540i xDrive | Base (3.0 L6 GAS) | Position: Radiator |
| 2017 | BMW | 530i | Base (2.0 L4 GAS) | Position: Radiator |
| 2017 | BMW | 530i xDrive | Base (2.0 L4 GAS) | Position: Radiator |
| 2017 | BMW | X3 | xDrive28d (2.0 L4 DIESEL) | |
| 2017 | BMW | X3 | sDrive28i (2.0 L4 GAS) | |
| 2017 | BMW | X3 | xDrive28i (2.0 L4 GAS) | |
| 2017 | BMW | X3 | xDrive35i (3.0 L6 GAS) | |
| 2016 | BMW | X5 | xDrive40e (2.0 L4 PHEV) | Position: Radiator |
| 2016 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2016 | BMW | X5 | sDrive35i (3.0 L6 GAS) | |
| 2016 | BMW | X5 | xDrive35i (3.0 L6 GAS) | |
| 2016 | BMW | X5 | xDrive50i (4.4 V8 GAS) | Position: Radiator |
| 2016 | BMW | 740i | Base (3.0 L6 GAS) | Position: Radiator |
| 2016 | BMW | 528i | Base (2.0 L4 GAS) | |
| 2016 | BMW | 528i xDrive | Base (2.0 L4 GAS) | |
| 2016 | BMW | X3 | xDrive35i (3.0 L6 GAS) | |
| 2015 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2015 | BMW | X5 | sDrive35i (3.0 L6 GAS) | |
| 2015 | BMW | X5 | xDrive35i (3.0 L6 GAS) | |
| 2015 | BMW | X5 | xDrive50i (4.4 V8 GAS) | Position: Radiator |
| 2015 | BMW | 740i | Base (3.0 L6 GAS) | |
| 2015 | BMW | 528i | Base (2.0 L4 GAS) | |
| 2015 | BMW | 528i xDrive | Base (2.0 L4 GAS) | |
| 2015 | BMW | X3 | xDrive28d (2.0 L4 DIESEL) | |
| 2015 | BMW | X3 | sDrive28i (2.0 L4 GAS) | |
| 2015 | BMW | X3 | xDrive28i (2.0 L4 GAS) | |
| 2015 | BMW | X3 | xDrive35i (3.0 L6 GAS) | |
| 2014 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2014 | BMW | X5 | sDrive35i (3.0 L6 GAS) | |
| 2014 | BMW | X5 | xDrive35i (3.0 L6 GAS) | |
| 2014 | BMW | X5 | xDrive50i (4.4 V8 GAS) | Position: Radiator |
| 2014 | BMW | 740i | Base (3.0 L6 GAS) | |
| 2014 | BMW | 528i | Base (2.0 L4 GAS) | |
| 2014 | BMW | 528i xDrive | Base (2.0 L4 GAS) | |
| 2014 | BMW | X3 | xDrive28i (2.0 L4 GAS) | |
| 2014 | BMW | X3 | xDrive35i (3.0 L6 GAS) | |
| 2013 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2013 | BMW | 740i | Base (3.0 L6 GAS) | |
| 2013 | BMW | 528i | Base (2.0 L4 GAS) | |
| 2013 | BMW | 528i xDrive | Base (2.0 L4 GAS) | |
| 2013 | BMW | X3 | xDrive28i (2.0 L4 GAS) | |
| 2013 | BMW | X3 | xDrive35i (3.0 L6 GAS) | |
| 2012 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2012 | BMW | 740i | Base (3.0 L6 GAS) | Notes: From 3/12, Notes: To 3/12, w/1.4 Bar |
| 2012 | BMW | 528i | Base (2.0 L4 GAS) | |
| 2012 | BMW | 528i xDrive | Base (2.0 L4 GAS) | |
| 2012 | BMW | X3 | xDrive28i (3.0 L6 GAS) | |
| 2011 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2011 | BMW | 740i | Base (3.0 L6 GAS) | Notes: w/1.4 Bar |
| 2010 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2009 | BMW | X5 | xDrive35d (3.0 L6 DIESEL) | |
| 2006 | BMW | 325i | Base (3.0 L6 GAS) | |
| 2006 | BMW | 330xi | Base (3.0 L6 GAS) | |
| 2021 | BMW | X3 | M (3.0 L6 GAS) | Position: Radiator |
| 2021 | BMW | X3 | M Competition (3.0 L6 GAS) | Position: Radiator |
Warranty Overview
At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.
Standard Warranty – Most Parts
Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.
Protection: Defects in materials or workmanship under normal personal use.
Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.
Exclusions:
Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)
Commercial, fleet, rideshare, off-road, or racing use
Improper installation, misuse, accidents, or modifications
Not Covered: Labor, shipping, towing, or incidental costs.
Bison Performance Warranty – Our House Brand
Coverage: Limited Lifetime Warranty for as long as you own your vehicle.
Applies To: All products sold under the Bison Performance label.
Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.
Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).
What’s Included: Replacement of the defective product (labor and shipping excluded).
Warranty Claim Requirements
To keep claims fast and fair, we require:
Proof of purchase (invoice or order confirmation).
Photos or videos showing the defective part, order number, date, VIN, and odometer reading.
Diagnostic reports or part returns for non-visible issues may be requested.
Claims must be truthful, properly documented, and reflect normal consumer use.
Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.
For full details and exclusions, please see our complete Warranty Terms & Conditions.
This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.
Return Policy Overview
Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
To start a return, contact customer support via Chat or Contact Us.
Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)
Refunds: Issued to your original payment method within 3–5 business days after inspection
Exchanges: Not automatic — please return and reorder
Replacements: May be approved for incorrect or defective items reported within 7 days
Not returnable:
Used or installed parts
Electrical components
Opened filter kits, gaskets, or contaminated items
Final sale or custom orders
Important Notes:
Return shipping is your responsibility unless we made a verified error
Fitment is the customer’s responsibility (we can assist, but do not guarantee)
Country of origin may vary and is not grounds for return
For complete details, please see our full Return Policy.
This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.
Fast, Reliable Shipping — Straight to Your Door
We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.
We use trusted carriers like UPS, FedEx, and USPS.
Tracking info is emailed to you as soon as your order ships.
Delivery estimates at checkout are based on carrier data, but not guaranteed.
Need help with a shipment?
If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.
For complete details, please see our full Shipping Policy.
This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.










