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  3. REIN SX-BT55

REIN SX-BT55 Transfer Fluid Xdrive 3.0L L6

fits make: Bmw. year: 2009–2015.

Sx-bt55 Rein Transfer Case Fluid For 2009-2015 Bmw 335i Xdrive 3.0l L6 Accessories Uk

( Brand: Rein ), ( Manufacturer Part Number: SX-BT55 ), ( Placement On Vehicle: Accessories Fluids Functional Fluid Lubricant Grease ), ( Compatible Model: 335i Xdrive ), ( Compatible Year: 2015 2014 2013 2012 2011 2010 2009 ), ( Core Charge: Free No Core Charge ), ( Type: Transfer Case Fluid ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Rein Transfer Case Fluid )

Review REIN Transfer Case Fluid Bmw Xdrive 3.0l L6 Accessories Uk fits 335I 2009–2015

The **REIN SX-BT55 Transfer Fluid** is a premium, fully synthetic, high-performance transfer case fluid specifically engineered to meet and exceed the rigorous demands of BMW s 2009 2015 335i xDrive models equipped with the 3.0L L6 inline-six engine paired with the xDrive all-wheel-drive system. Designed to optimize traction, durability, and efficiency, this fluid is meticulously formulated to ensure seamless operation of the Haldex TCC (torque coupling clutch) and the transfer case, which work in tandem to deliver precise power distribution between the front and rear axles. Unlike conventional transfer fluids, REIN SX-BT55 incorporates advanced synthetic additives that enhance lubrication, reduce internal friction, and prevent wear on critical components such as gears, bearings, and seals critical for maintaining the longevity and performance of the xDrive system. Its high-temperature stability ensures consistent viscosity and protection even under the intense heat generated during spirited driving, aggressive acceleration, or prolonged high-load conditions, which are common in high-performance applications. Additionally, the fluid s superior oxidation resistance minimizes sludge formation and extends the service interval, reducing maintenance hassles and potential drivetrain issues. Whether navigating wet roads, snow, or off-road terrain, REIN SX-BT55 provides reliable all-weather performance, ensuring optimal engagement of the xDrive system while safeguarding against premature failure. For BMW enthusiasts seeking a blend of cutting-edge technology and dependable protection, this fluid represents the ideal choice to preserve the integrity of the 3.0L L6 s power delivery and the xDrive s legendary responsiveness.

### Pros and Cons of Buying Rein SX-BT55 Transfer Fluid for a 2009 2015 BMW 335i xDrive (3.0L L6)

#### **Pros:**

1. **Compatibility** Rein SX-BT55 is specifically formulated for BMW xDrive systems, including the 3.0L L6 engine models from 2009 2015. It is designed to work with the N63 engine s transmission and transfer case, ensuring proper lubrication and protection.

2. **High-Quality Synthetic Base** Rein uses a synthetic or semi-synthetic base stock, which provides better thermal stability, longer service life, and improved resistance to oxidation compared to conventional fluids. This helps maintain smooth operation in the transfer case and differential.

3. **Cold-Weather Performance** The fluid is formulated to perform well in low temperatures, reducing sluggishness in cold starts and preventing fluid thickening, which is critical for xDrive systems that engage both front and rear axles.

4. **Proper Viscosity** The BT55 specification ensures the correct viscosity for BMW s xDrive transfer cases, preventing leaks, excessive wear, or poor shifting performance.

5. **OEM-Approved Alternative** While not an exact BMW factory fluid, Rein is a reputable brand that adheres to BMW s specifications, making it a trusted aftermarket option for owners who prefer a cost-effective but high-quality alternative to BMW s original fluid.

6. **Ease of Availability** Rein fluids are widely available through online retailers, auto parts stores, and BMW specialty shops, making it convenient to purchase without long waits or high costs.

7. **Longer Fluid Life** Due to its synthetic properties, Rein SX-BT55 typically lasts longer than conventional fluids, reducing the frequency of flushes and maintenance intervals.

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#### **Cons:**

1. **Not a Direct BMW Factory Replacement** While Rein is a good alternative, it is not the exact same fluid as BMW s original specification (e.g., BMW LL-01 or LL-04). Some purists argue that using a non-OEM fluid may not provide the same level of protection or longevity, though this is debated among mechanics.

2. **Potential Incompatibility with Additives** If your vehicle has been serviced with other fluids or additives (e.g., BMW s LL-01 or LL-04), mixing them with Rein could theoretically reduce performance. However, Rein is designed to be compatible with most modern fluids, and a proper flush before switching should mitigate this risk.

3. **Price Sensitivity** While Rein is more affordable than BMW s original fluid, it may still be more expensive than generic or non-branded transfer fluids. For budget-conscious buyers, this could be a minor drawback.

4. **Limited Long-Term Data** Rein is a well-regarded brand, but long-term real-world performance data (especially in extreme conditions) may not be as extensive as BMW s factory fluids, which have been tested under rigorous OEM standards.

5. **Risk of Counterfeit Products** As with any aftermarket product, there is a risk of purchasing counterfeit Rein fluid, which could compromise performance or damage the transfer case. Buying from reputable sellers (e.g., Amazon, RockAuto, or authorized BMW dealers) minimizes this risk.

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### **Ending Conclusion:**

Rein SX-BT55 is a **strong, reliable, and cost-effective choice** for servicing the transfer case in a 2009 2015 BMW 335i xDrive (3.0L L6). It offers the necessary protection, cold-weather performance, and compatibility with BMW s xDrive system while being more affordable than OEM fluids. The synthetic formulation ensures longevity and reduces maintenance frequency, making it a practical option for most owners.

For those who prioritize **absolute OEM specifications** or have concerns about long-term performance, BMW s original LL-01 or LL-04 fluid may be preferable, though it comes at a higher cost. However, for the vast majority of drivers, Rein SX-BT55 provides an excellent balance of quality, performance, and value.

### **Recommendation:**

**Use Rein SX-BT55 for your 2009 2015 BMW 335i xDrive transfer case fluid.** Ensure you perform a **complete flush** before switching fluids if your vehicle has previously used a different type (e.g., BMW LL-01). Purchase from a trusted retailer to avoid counterfeit products, and follow the manufacturer s recommended service intervals. If you plan to keep the vehicle long-term or drive in extreme conditions, consider supplementing with a high-quality BMW-specific additive (e.g., Liqui Moly or BMW LL-04) for added protection.

Details:

Rein Transfer Case Fluid for 2009 - 2015 BMW 335I xDrive 3.0L L6 Accessories uk: Status: In Stock.

part #: sxbt55 price

  • $67.44

specifications automobilefluids:

  • for makes: Bmw
  • for years: 2009-2015
  • brand: Rein
  • mpn: Sx-bt55
  • placement on vehicle: Accessories Fluids Functional Fluid Lubricant Grease
  • compatible model: 335i Xdrive
  • compatible year: 2015 2014 2013 2012 2011 2010 2009
  • core charge: Free No Core Charge
  • type: Transfer Case Fluid
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine Rein Transfer Case Fluid

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  • Automotive Tools Supplies > Fluids Chemicals > Other Fluids Chemicals

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  • started: June 10, 2026
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for makes: bmw, for years: 2009-2015, placement on vehicle: accessories fluids functional fluid lubricant grease, compatible model: 335i xdrive, compatible year: 2015 2014 2013 2012 2011 2010 2009, core charge: free no core charge, type: transfer case fluid, fitment type: direct replacement, bundle description: 1 pc genuine rein transfer case fluid,
category: auto parts > tools supplies > fluids chemicals, sku: 13431377843519721,
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