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  3. REIN SX-FB9J

REIN SX-FB9J Transfer Fluid Alpina Xdrive Ms 4.4L V8

fits make: Bmw. year: 2011–2015.

Sx-fb9j Rein Transfer Case Fluid For 2011-2015 Bmw Alpina B7 Xdrive 4.4l V8 Ms

( Brand: Rein ), ( Manufacturer Part Number: SX-FB9J ), ( Placement On Vehicle: Accessories Fluids Functional Fluid Lubricant Grease ), ( Compatible Model: Alpina B7 Xdrive ), ( Compatible Year: 2015 2014 2013 2012 2011 ), ( 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 Alpina Xdrive 4.4l V8 Ms fits B7 2011–2015

The **REIN 41-0000 SX-FB9J Transfer Case Fluid** is a premium, fully synthetic, high-performance fluid meticulously formulated to deliver exceptional protection, efficiency, and longevity for the **2011 2015 BMW Alpina B7 XDrive 4.4L V8 MS (M Sport) models**, which feature the **ZF 8HP90 six-speed automatic transmission paired with the 8HP95 transfer case**. Engineered to meet and exceed the stringent demands of BMW s high-output, torque-rich powertrains, this fluid ensures seamless operation of the **XDrive all-wheel-drive system**, optimizing power distribution between the front and rear axles while minimizing wear, friction, and heat buildup.

Designed with a **high-viscosity index and superior thermal stability**, REIN SX-FB9J provides outstanding protection under extreme temperatures, whether navigating the rigors of winter driving or the intense heat generated during spirited acceleration on the Autobahn or track. Its **advanced additive package** includes anti-wear, anti-foaming, and extreme-pressure agents that safeguard the precision-engineered gears, synchronizers, and bearings within the transfer case, preventing premature degradation and ensuring smooth, responsive shifting. The fluid s **low volatility and resistance to oxidation** extend the service life of the system, reducing the risk of fluid breakdown and costly repairs over time.

For BMW enthusiasts who demand nothing less than perfection, REIN SX-FB9J is **OEM-spec compliant**, ensuring compatibility with the **ZF 8HP95 transfer case** found in the Alpina B7, while also providing enhanced performance beyond standard factory specifications. Its **dark amber hue** serves as a clear indicator of its synthetic formulation, distinguishing it from conventional mineral-based fluids and signaling its superior durability. Whether used in a daily driver, a performance-oriented vehicle, or a meticulously maintained collector s car, this fluid guarantees **optimal drivetrain protection, reduced noise, and improved efficiency**, allowing the 4.4L V8 s potent power to be fully harnessed without compromising the integrity of the XDrive system.

Ideal for **fluid changes, top-offs, or complete drivetrain servicing**, REIN SX-FB9J is a trusted choice for mechanics and BMW owners who prioritize **long-term reliability and performance**. Its **high-quality synthetic base stock** ensures consistent lubrication under high loads, while its **resistance to sludge formation** keeps the transfer case clean and operating at peak efficiency. By choosing REIN SX-FB9J, owners of the Alpina B7 XDrive can maintain the vehicle s **sporting pedigree and luxury standards**, ensuring that every drive whether on the street or the track is met with the precision and power the brand is renowned for.

### Pros and Cons of Buying Rein SX-FB9J Transfer Fluid for a 2011-2015 BMW Alpina B7 XDrive 4.4L V8 (MS)

#### **Pros:**

1. **Compatibility and Quality** Rein is a well-regarded brand known for producing high-quality, OEM-specification fluids. Their transfer case fluid for the BMW N63 engine family (which includes the Alpina B7) is designed to meet or exceed BMW s original specifications, ensuring proper lubrication and protection for the transfer case and differential.

2. **Extended Service Life** Rein fluids are formulated to resist oxidation, thermal breakdown, and foaming, which helps maintain performance over longer intervals compared to cheaper or lower-quality alternatives. This can reduce the frequency of fluid changes and extend the lifespan of your transfer case.

3. **Cold Weather Performance** The fluid is engineered to remain fluid in cold temperatures, which is particularly important for the XDrive system in a BMW Alpina, where the transfer case must engage smoothly in all conditions. Rein s formulation helps prevent sluggish shifting or binding in winter.

4. **Synergy with BMW Systems** Since BMW vehicles often use specialized fluids, Rein s compatibility ensures that the transfer case operates efficiently alongside the rest of the drivetrain, including the differential and transmission. This reduces the risk of fluid incompatibility issues that could lead to premature wear.

5. **Warranty and Reliability** Rein is a trusted brand with a reputation for reliability, and their products are often recommended by BMW specialists and tuners. Using a reputable brand like Rein can provide peace of mind, especially for high-performance or modified vehicles where drivetrain integrity is critical.

6. **Ease of Use** Rein fluids are typically easy to source, whether through BMW dealerships, specialty auto parts stores, or online retailers. They are also straightforward to install, requiring only a drain, flush, and refill process.

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#### **Cons:**

1. **Cost** Rein transfer case fluid is more expensive than generic or aftermarket alternatives. For a vehicle like the Alpina B7, where fluid changes are already a significant investment (due to the complexity of the XDrive system), the cost can add up, especially if you need to perform frequent changes.

2. **Limited Availability** While Rein is widely available, some smaller or regional auto parts stores may not carry it. This could require ordering online, which may involve shipping delays or higher costs if you need the fluid urgently.

3. **Overkill for Mild Use** If your Alpina B7 is primarily driven in mild conditions with moderate to light use, a high-performance fluid like Rein may be more than necessary. In such cases, a slightly less expensive but still high-quality fluid (e.g., Motul, Liqui Moly, or a BMW-approved alternative) might suffice without sacrificing performance.

4. **Potential for Over-Flushing** Some owners or mechanics may over-flush the system when changing Rein fluid, leading to unnecessary labor costs or the risk of introducing contaminants if the system isn t properly cleaned before refilling.

5. **Mixed Reviews on Durability** While Rein is generally reliable, some users report that the fluid s performance degrades more quickly than expected in extreme conditions (e.g., heavy towing, aggressive driving, or prolonged high-load operation). This is less common but worth considering if you push your vehicle hard.

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### **Conclusion:**

Rein SX-FB9J transfer fluid is an excellent choice for a 2011-2015 BMW Alpina B7 XDrive 4.4L V8, particularly if you prioritize long-term drivetrain protection, cold-weather performance, and compatibility with BMW s high-performance systems. The pros such as its OEM-level quality, extended service life, and reliability far outweigh the cons for most owners, especially those who drive their vehicles aggressively or in demanding conditions.

However, if budget is a concern or if your driving habits are relatively mild, you may consider a slightly less expensive but still high-quality alternative (e.g., Motul Gear 320 or Liqui Moly XWD Fluid). That said, Rein remains one of the safest and most recommended options for BMW XDrive systems, and its benefits in terms of longevity and performance justify the cost for many enthusiasts.

### **Recommendation:**

For the 2011-2015 BMW Alpina B7 XDrive 4.4L V8, **I recommend using Rein SX-FB9J transfer fluid** as your primary choice. It strikes the best balance between quality, performance, and compatibility with BMW s specifications. If you re on a tighter budget or drive the vehicle lightly, a BMW-approved alternative like Motul Gear 320 (if available for your specific model) could be a viable second option, but Rein remains the gold standard for this application.

Always follow BMW s recommended fluid change intervals (typically every 60,000 100,000 miles or as specified in your service manual) and ensure the fluid is changed in accordance with proper flushing procedures to maximize its effectiveness. If you re unsure about compatibility or have modified the drivetrain, consult a BMW specialist to confirm the best fluid for your specific setup.

Details:

Rein Transfer Case Fluid for 2011 - 2015 BMW Alpina B7 xDrive 4.4L V8 ms: Status: In Stock.

part #: sxfb9j price

  • $67.44

specifications automobilefluids:

  • for makes: Bmw
  • for years: 2011-2015
  • brand: Rein
  • mpn: Sx-fb9j
  • placement on vehicle: Accessories Fluids Functional Fluid Lubricant Grease
  • compatible model: Alpina B7 Xdrive
  • compatible year: 2015 2014 2013 2012 2011
  • core charge: Free No Core Charge
  • type: Transfer Case Fluid
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine Rein Transfer Case Fluid

seller automobilefluids:

  • city: Indianapolis, Indiana
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  • # reviews: 666445

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  • started: June 10, 2026
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for makes: bmw, for years: 2011-2015, placement on vehicle: accessories fluids functional fluid lubricant grease, compatible model: alpina b7 xdrive, compatible year: 2015 2014 2013 2012 2011, 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: 13433830351599603,
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