1. Exhaust & Emission Parts To Buy
  2. sku: 21562626053452892
  3. REIN SX-4GD4

REIN SX-4GD4 Valve Cover Hose Crankcase Breather 4.4L V8

fits model: 650i. make: Bmw. year: 2012.

Sx-4gd4 Rein Valve Cover To Hose Crankcase Breather For 2012 Bmw 650i 4.4l V8 Jj

( Brand: Rein ), ( Manufacturer Part Number: SX-4GD4 ), ( Ipn: C722 67-29 ), ( Placement On Vehicle: Emission Control Crankcase Ventilation System ), ( Core Charge: Free No Core Charge ), ( Position: Valve Cover To Hose ), ( Type: Engine Crankcase Breather Hose ), ( Universal Fitment: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Rein Engine Crankcase Breather Hose )

Review REIN Valve Cover To Hose Crankcase Breather Bmw 4.4l V8 fits 650I 2012

The **Rein SX-4GD4 Valve Cover Hose and Crankcase Breather** is a meticulously engineered replacement component designed specifically for the **2012 BMW 6 Series (E63) 650i with the 4.4L TwinPower Turbo V8 engine**. This high-performance breather system is crafted to restore optimal engine breathing efficiency while ensuring a secure, leak-free connection between the valve cover and the crankcase ventilation circuit. Engineered from **high-quality, durable materials**, including a reinforced silicone or rubber compound, the hose is built to withstand the demanding conditions of high-performance driving, including turbocharged operation and elevated underhood temperatures. The **precision-molded design** ensures a perfect fit over the valve cover s breather port, eliminating the risk of kinking, cracking, or premature wear common issues that can lead to oil leaks, reduced engine efficiency, or even costly internal damage. This breather system is also compatible with BMW s **crankcase ventilation (PCV) system**, allowing proper oil vapor recirculation back into the intake manifold, which helps maintain optimal oil pressure and reduces emissions. Whether you re restoring stock performance or upgrading for enhanced reliability, the Rein SX-4GD4 is a **direct-fit, OEM-quality replacement** that delivers the durability and performance expected from BMW s high-end powertrains. Proper installation is essential, and pairing this part with a high-quality gasket and torque-to-spec fasteners ensures a long-lasting, trouble-free solution for your 4.4L V8.

Buying the **Rein SX-4GD4 valve cover hose and crankcase breather** for a 2012 BMW 650i (4.4L V8) can be a practical solution for addressing emissions and engine health issues, but it comes with both advantages and drawbacks. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Rein SX-4GD4 Valve Cover Hose and Crankcase Breather**

1. **OEM Replacement Quality**

The Rein part is designed as a direct replacement for the original BMW component, ensuring compatibility with the 2012 650i s engine bay layout. This reduces the risk of fitment issues that can occur with aftermarket parts that are not specifically engineered for BMW vehicles.

2. **Improved Emissions Control**

The crankcase breather system helps manage blow-by gases (unburned fuel and oil vapors) that escape past the piston rings. A failing or clogged breather can lead to increased emissions, reduced engine efficiency, and potential damage to the PCV (Positive Crankcase Ventilation) system. Rein s part is designed to properly channel these gases back into the intake, reducing emissions and preventing oil dilution in the combustion chamber.

3. **Prevents Oil Leaks and Contamination**

A properly functioning breather system prevents oil from leaking into the intake manifold or air filter housing, which can cause engine misfires, fouling of spark plugs, and damage to the catalytic converter. The Rein part is designed to maintain a sealed system, reducing the risk of these issues.

4. **Compatibility with Turbocharged Engines**

The 4.4L V8 in the 650i is turbocharged, which increases the pressure in the crankcase. A high-quality breather like the Rein SX-4GD4 is engineered to handle the higher pressures associated with turbocharged engines, reducing the risk of breather failure under boost.

5. **Durability and Longevity**

Rein is known for producing durable aftermarket parts that are built to last. The materials used in the valve cover hose and breather are typically resistant to heat, oil, and engine fluids, which helps extend the lifespan of the component compared to cheaper or generic alternatives.

6. **Easy Installation**

The Rein part is designed for straightforward installation, often requiring only basic tools. Many users report that it fits without modifications, saving time and labor compared to custom or non-OEM parts that may require cutting or adapting.

7. **Support for Engine Performance**

By maintaining proper crankcase pressure, the Rein breather helps keep the engine running smoothly and efficiently. This can indirectly support performance by preventing oil consumption, reducing carbon buildup on valves, and maintaining optimal engine vacuum levels.

8. **Warranty and Reliability**

Rein offers warranties on their parts, which provides some peace of mind in case of defects. Additionally, the part is widely available through reputable online retailers and BMW specialty shops, ensuring reliability in sourcing.

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### **Cons of the Rein SX-4GD4 Valve Cover Hose and Crankcase Breather**

1. **Cost Compared to OEM**

While Rein parts are high-quality, they are not OEM (Original Equipment Manufacturer) components. The price is typically higher than generic aftermarket parts but may still be more expensive than the original BMW part if it were available as a direct replacement (though BMW rarely sells these parts individually). For a 2012 650i, the cost may be a significant investment if the original part has failed.

2. **Potential for Counterfeit Parts**

Rein is a well-regarded brand, but like many aftermarket manufacturers, there is a risk of purchasing counterfeit or low-quality knockoffs, especially when buying from untrusted sellers. Always verify the authenticity of the part through reputable dealers or authorized distributors.

3. **Limited Customization**

The Rein part is a direct replacement and does not offer customization options (e.g., different materials, lengths, or flow rates). If you are looking for performance tuning or specific modifications, this part may not be ideal, and you might need to explore other solutions.

4. **Installation Complexity for DIYers**

While the Rein part is designed for easy installation, some users may find the process challenging if they are not experienced with engine bay work. The 650i s engine bay is compact, and accessing the valve cover and breather can require careful maneuvering to avoid damaging other components (e.g., wiring harnesses, coolant lines).

5. **Dependence on Other Systems**

The crankcase breather works in conjunction with the PCV system and other emissions components. If other parts of the system (e.g., PCV valve, intake manifold gaskets) are failing, replacing just the breather and hose may not fully resolve the issue. A thorough diagnosis is recommended before purchasing.

6. **Potential for Material Degradation Over Time**

While Rein parts are durable, all rubber and plastic components can degrade over time due to heat, oil exposure, and engine wear. The valve cover hose, in particular, may need replacement if it cracks or becomes brittle, especially in high-mileage vehicles.

7. **Limited Availability of Technical Support**

While Rein provides warranties, their customer support may not be as responsive as BMW s official service network. If installation issues or defects arise, resolving them may require additional effort or costs.

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### **Conclusion**

The **Rein SX-4GD4 valve cover hose and crankcase breather** is a strong choice for a 2012 BMW 650i (4.4L V8) owner facing issues with emissions, oil leaks, or crankcase pressure. Its OEM-like quality, durability, and compatibility with turbocharged engines make it a reliable upgrade. However, the cost, potential for counterfeit parts, and the need for careful installation should be considered. If your primary goal is to restore proper emissions control and prevent engine contamination, this part is highly recommended. If you are experiencing broader engine issues (e.g., oil consumption, misfires), it may be wise to address those root causes alongside the breather replacement.

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### **Recommendation**

1. **Verify the Need**: Before purchasing, confirm that the issue is specifically related to the valve cover hose or crankcase breather. Symptoms like oil leaks from the valve cover, excessive crankcase pressure (indicated by a hissing sound or oil in the air filter), or check engine lights related to the PCV system warrant this replacement.

2. **Purchase from a Trusted Source**: Buy the Rein part from an authorized dealer, reputable online retailer (e.g., RockAuto, BMW Parts Online), or a BMW specialty shop to avoid counterfeit products.

3. **Consider a Full System Check**: If you are replacing the breather, inspect the PCV valve, valve cover gasket, and intake manifold gaskets for leaks or wear. Addressing these simultaneously can prevent future issues.

4. **DIY or Professional Installation**: If you are comfortable with engine bay work, proceed with installation yourself. Otherwise, have a trusted mechanic perform the replacement to ensure proper fitment and sealing.

5. **Monitor Post-Installation**: After replacement, monitor for improvements in emissions, oil consumption, and engine performance. If issues persist, further diagnosis may be needed.

**Final Verdict**: The Rein SX-4GD4 is a **highly recommended** choice for a 2012 BMW 650i owner seeking a reliable, OEM-quality replacement for the valve cover hose and crankcase breather. It strikes a balance between performance, durability, and compatibility, making it a practical solution for maintaining engine health.

Details:

Rein Valve Cover To Hose Crankcase Breather for 2012 BMW 650I 4.4L V8 jj: Status: In Stock.

part #: sx4gd4 prices

  • $57.45-$69.50

specifications emissyste:

  • for models: 650i
  • for makes: Bmw
  • for years: 2012
  • brand: Rein
  • mpn: Sx-4gd4
  • ipn: C722 67-29
  • placement on vehicle: Emission Control Crankcase Ventilation System
  • core charge: Free No Core Charge
  • position: Valve Cover To Hose
  • type: Engine Crankcase Breather Hose
  • universal fitment: Direct Replacement
  • bundle description: 1 Pc Genuine Rein Engine Crankcase Breather Hose

returns emissyste:

  • policy: Returns Accepted
  • paid by: Seller
  • time: 30 Days

payments emissyste:

  • wallet: Google-pay
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  • transit: 2-6 Days
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  • type: Fixed
  • service: Standard, Expedited

offer emissyste:

  • started: April 22, 2026
  • options: Ship-to-home
  • sold: 0
  • availability: In Stock
  • quantity: 2

seller emissyste:

  • # reviews: 648288
  • rating: 99.6%
  • city: Indianapolis, Indiana

general emissyste:

  • condition: New
  • Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts
for models: 650i, for makes: bmw, for years: 2012, placement on vehicle: emission control crankcase ventilation system, core charge: free no core charge, position: valve cover to hose, type: engine crankcase breather hose, universal fitment: direct replacement, bundle description: 1 pc genuine rein engine crankcase breather hose,
category: auto parts > car truck parts accessories > exhaust emission systems > exhaust emission parts, sku: 21562626053452892,
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