1. Exhaust & Emission Parts To Buy
  2. sku: 20060378670876721
  3. REIN SX-K4YW

REIN SX-K4YW Crankcase Breather Hose Engine Emission Ro 3.0L L6

fits model: 435i. make: Bmw. year: 2014–2016.

Sx-k4yw Rein Crankcase Breather Hose For 2014-2016 Bmw 435i 3.0l L6 Engine Emission Ro

( Brand: Rein ), ( Manufacturer Part Number: SX-K4YW ), ( Ipn: C577 5-16 ), ( Placement On Vehicle: Emission Control Crankcase Ventilation System ), ( Compatible Year: 2016 2015 2014 ), ( Core Charge: Free No Core Charge ), ( Type: Engine Crankcase Breather Hose ), ( Universal Fitment: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Rein Engine Crankcase Breather Hose )

Review REIN Crankcase Breather Hose Bmw 3.0l L6 Engine Emission Ro fits 435I 2014–2016

The **Rein SX-K4YW Crankcase Breather Hose** is a meticulously engineered, high-performance replacement part designed specifically for the **2014 2016 BMW 435i with the 3.0L L6 N55 engine**, ensuring optimal emissions compliance and engine protection while maintaining peak efficiency. Crafted from **durable, heat-resistant synthetic rubber**, this hose is built to withstand the demanding conditions of high-performance driving, extreme temperatures, and the constant pressure fluctuations inherent in modern turbocharged engines. Unlike generic aftermarket alternatives, the Rein SX-K4YW is **OEM-toleranced**, meaning it precisely matches the original equipment dimensions and routing, eliminating the risk of leaks, vacuum loss, or improper sealing that can compromise engine performance and trigger check engine lights. The reinforced construction prevents premature cracking or degradation, which is particularly critical for the **N55 engine s turbocharged operation**, where proper crankcase ventilation is essential for maintaining turbo efficiency and preventing oil contamination in the intake system. This hose also plays a vital role in **emissions compliance**, directing blow-by gases away from the engine bay and into the intake manifold through the **PCV (Positive Crankcase Ventilation) system**, reducing harmful hydrocarbon emissions and ensuring the vehicle passes inspections without issue. Whether used in daily driving or high-performance applications, the Rein SX-K4YW delivers **reliability, precision, and longevity**, making it an indispensable upgrade for BMW owners seeking to preserve their engine s health and performance while adhering to strict emissions regulations.

### Pros and Cons of buying a Rein SX-K4YW Crankcase Breather Hose for a 2014 2016 BMW 435i (3.0L L6 Engine with Emission RO)

#### **Pros:**

1. **OEM Fitment and Compatibility** The Rein SX-K4YW is designed specifically for the 2014 2016 BMW 435i with the 3.0L L6 engine, including the RO emission variant. This ensures a proper fit without modifications, reducing the risk of leaks or improper installation.

2. **High-Quality Materials** Rein is known for using durable materials that resist cracking, hardening, or degrading over time, which helps maintain engine cleanliness and prevent carbon buildup.

3. **Improved Engine Breathing** A properly functioning crankcase breather hose helps regulate pressure within the engine bay, reducing blow-by gases that can contaminate the oil and contribute to carbon deposits.

4. **Emission Compliance** Since the RO emission system is sensitive to proper airflow and filtration, a reliable breather hose helps maintain compliance with emission standards while preventing oil leaks into the intake system.

5. **Easy Installation** The hose is designed for straightforward replacement, requiring minimal tools and time. Most users report that it can be installed in under an hour with basic mechanical skills.

6. **Cost-Effective Solution** Compared to more expensive OEM or aftermarket alternatives, the Rein part offers a balance between affordability and performance, avoiding the need for frequent replacements.

7. **Reduced Engine Noise and Vibration** A failing breather hose can cause rattling or hissing noises. Replacing it with a Rein part often eliminates these issues, contributing to a quieter engine bay.

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#### **Cons:**

1. **Potential for Counterfeit Parts** Like many aftermarket BMW parts, there is a risk of purchasing a counterfeit Rein product. Buying from an authorized dealer or a reputable online retailer (e.g., BMW-specific suppliers, RockAuto, or eBay with verified sellers) helps mitigate this risk.

2. **Limited Long-Term Warranty** Rein parts typically come with a limited warranty (often 1 2 years), which may not cover all potential failure modes, especially if installed improperly or exposed to extreme conditions.

3. **Compatibility with Modifications** If the vehicle has been modified (e.g., forced induction, exhaust tuning, or intake upgrades), the stock breather setup may not fully accommodate increased airflow demands. In such cases, a more robust solution (e.g., a dual-tube breather system) might be necessary.

4. **Installation Challenges for DIYers** While generally straightforward, some users report that the hose may be slightly tight to install due to its snug fit. Improper handling during installation could lead to damage or leaks.

5. **Price Sensitivity** While affordable compared to OEM parts, the Rein SX-K4YW may still be more expensive than generic aftermarket alternatives. However, the trade-off is better reliability and compatibility.

---

### **Conclusion:**

The Rein SX-K4YW crankcase breather hose is a **strong, reliable choice** for the 2014 2016 BMW 435i (3.0L L6, RO emission) due to its OEM-level fitment, durability, and ease of installation. It addresses common issues like oil leaks, carbon buildup, and engine noise while maintaining emission compliance. However, buyers should ensure they purchase from a trusted source to avoid counterfeit parts and verify compatibility if the vehicle has been modified.

For most owners seeking a **direct replacement with minimal hassle**, the Rein part is an excellent option. Those with extensive modifications or concerns about long-term reliability might consider a higher-end aftermarket breather system, but the Rein SX-K4YW strikes a solid balance for standard applications.

---

### **Recommendation:** **Purchase the Rein SX-K4YW crankcase breather hose** for your 2014 2016 BMW 435i if:

- You need a **direct OEM replacement** with minimal risk of leaks or improper fit.

- You want a **durable, long-lasting solution** that reduces engine contaminants.

- You prefer a **balanced cost-performance ratio** over generic alternatives.

**Avoid it if:**

- You suspect the vehicle has been heavily modified (e.g., forced induction), as additional airflow solutions may be needed.

- You cannot confirm the authenticity of the part (stick to reputable sellers).

**Installation Tip:** Follow BMW s service manual guidelines for proper routing and securing the hose to prevent vibration-induced failure. If unsure, consult a BMW technician for installation.

Details:

Rein Crankcase Breather Hose for 2014 - 2016 BMW 435I 3.0L L6 Engine Emission ro: Status: In Stock.

part #: sxk4yw prices

  • $66.96-$68.01

specifications emissyste:

  • for models: 435i
  • for makes: Bmw
  • for years: 2014-2016
  • brand: Rein
  • mpn: Sx-k4yw
  • ipn: C577 5-16
  • placement on vehicle: Emission Control Crankcase Ventilation System
  • compatible year: 2016 2015 2014
  • core charge: Free No Core Charge
  • type: Engine Crankcase Breather Hose
  • universal fitment: Direct Replacement
  • bundle description: 1 Pc Genuine Rein Engine Crankcase Breather Hose

seller emissyste:

  • rating: 99.5%
  • city: Indianapolis, Indiana
  • # reviews: 621349

general emissyste:

  • condition: New
  • Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

shipping emissyste:

  • type: Fixed
  • service: Standard, Expedited
  • transit: 2-7 Days
  • class: Standard, Expedited
  • cost: $0.00

offer emissyste:

  • sold: 0
  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
  • started: February 10, 2026

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for models: 435i, for makes: bmw, for years: 2014-2016, placement on vehicle: emission control crankcase ventilation system, compatible year: 2016 2015 2014, core charge: free no core charge, 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: 20060378670876721,
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