BMW 8483797 Engine Crankshaft Rear Seal Cover M850I G15 4.4L

( Manufacturer Part Number: 8483797 ), ( Part Type: Seal Cover Engine Crankshaft ), ( Oe/oem Part Number: 11148483798 / 1114-8483798 / 1114-8-483-798 ), ( Items Included: Rear Main Seal Retainer ), ( Vintage Part: No ), ( Country Of Origin: Germany )

Review BMW G15 4.4l Engine Crankshaft Rear Main Seal Cover Oem fits M8 2019–2025

The **BMW M850i (G15) 2019 2025 4.4L Twin-Turbo V8 Engine Crankshaft Rear Seal Cover (Part Number: 8483797)** is a precision-engineered component designed to ensure optimal performance, durability, and reliability within the high-performance powertrain of BMW s flagship M8 series. This critical sealing element is strategically positioned at the rear of the **S63 4.4L twin-turbocharged V8 engine**, where it plays a vital role in maintaining proper oil containment and preventing leaks that could compromise engine integrity. Crafted from high-grade **elastomeric materials** reinforced with durable synthetic fibers, the seal cover is engineered to withstand extreme temperatures, high-pressure oil circulation, and the relentless demands of M8 s aggressive driving dynamics whether in track-focused performance mode or daily highway cruising. The design incorporates a **precision-molded lip seal** that conforms seamlessly to the crankshaft s polished surface, minimizing friction while maximizing longevity, even under the high RPM and torque outputs characteristic of the S63 engine. For M8 owners and mechanics, this part is indispensable for maintaining the engine s performance envelope, as leaks from this area can lead to costly oil contamination, reduced efficiency, or even catastrophic failure in severe cases. Replacement of the crankshaft rear seal cover is often recommended during routine M8 maintenance intervals or as a preventive measure after prolonged high-load operation, ensuring the engine remains in peak condition for both performance and longevity. Whether sourced as an OEM replacement or a high-quality aftermarket alternative, this component underscores BMW s commitment to engineering excellence in its most exclusive M division models.

### **Pros and Cons of Buying a 2019 2025 BMW M850i (G15) with a 4.4L Engine and Crankshaft Rear Seal Cover Issue**

#### **Overview**

The **BMW M850i (G15)** is a high-performance luxury sedan based on the 8 Series, featuring a **4.4L twin-turbo V8 engine** paired with an **8-speed ZF Steptronic transmission**. While it delivers exceptional power, refinement, and luxury, it is not without potential concerns particularly regarding the **crankshaft rear seal cover**, which has been a known issue in some units.

---

### **Pros**

1. **Exceptional Performance**

- The **4.4L twin-turbo V8** produces **625 hp (630 hp in some markets)** and **553 lb-ft of torque**, making it one of the most powerful BMW sedans ever.

- **0-60 mph in 3.5 seconds** (with the 8-speed auto) and a **top speed of 155 mph** (electronically limited).

- **Launch Control** and **Dynamic Shift Control** enhance driving dynamics.

2. **Luxury and Comfort**

- **Premium interior** with high-quality materials, ambient lighting, and advanced infotainment (iDrive 8).

- **Adaptive suspension (M Suspension)** improves ride comfort while maintaining sharp handling.

- **Quiet cabin** with excellent sound insulation, even at high speeds.

3. **Advanced Technology & Safety**

- **BMW s latest safety suite**, including **autonomous emergency braking, blind-spot monitoring, and 360-degree cameras**.

- **Wireless Apple CarPlay and Android Auto** integration.

- **Heated/ventilated seats, panoramic sunroof, and premium audio systems** (optional).

4. **Exclusive M Brand Features**

- **M Sport Package** (available) includes **M badging, unique alloy wheels, and sport-tuned suspension**.

- **M Driving Experience (MDE)** mode enhances throttle response and steering feel.

- **M Performance Package** (optional) adds **carbon fiber elements, larger brakes, and a sportier exhaust note**.

5. **Resale Value & Prestige**

- BMW s **M models hold value well**, especially the **M850i**, which remains highly desirable.

- **Exclusive status** owning an M850i signals luxury and performance.

6. **Reliability of the 4.4L Twin-Turbo V8**

- **BMW s twin-turbo V8s have improved significantly** over past generations, with better durability and efficiency.

- **Less prone to common issues** (like carbon buildup) seen in older turbocharged engines if maintained properly.

---

### **Cons**

1. **Crankshaft Rear Seal Cover Issue (Primary Concern)**

- Some **2019 2025 M850i models** (and other BMWs with the **N74/N74B44 engine**) have reported **crankshaft rear seal cover leaks**, leading to:

- **Oil leaks** (visible under the engine or dripping onto the ground).

- **Potential for oil contamination** in the **valvetronic system** (if oil enters, it can cause **rough idle, misfires, or reduced performance**).

- **BMW has issued service bulletins** and **recalls** (e.g., **2020 2021 models**) to replace faulty seals.

- **Cost of repair**: **$1,000 $2,000** (labor parts), depending on dealership vs. independent shop.

2. **High Cost of Ownership**

- **Fuel economy is poor** ( 12 14 MPG combined), making it expensive to drive.

- **Maintenance costs** (tires, brakes, fluids) are **higher than average** due to premium components.

- **Insurance premiums** will be **significantly higher** than a standard 850i.

3. **Potential Transmission Issues**

- Some owners report **rough shifting or delayed engagement** in the **8-speed ZF Steptronic**, though this is less common than in older M models.

- **Software updates** may help, but mechanical failures are possible over time.

4. **Weight & Handling Trade-offs**

- The **M850i is heavy ( 4,400 4,600 lbs)**, which can make **aggressive cornering feel less nimble** compared to lighter sports sedans.

- While **M Suspension helps**, it s not as sharp as an **M8 Competition or M8 XDrive**.

5. **Limited Practicality**

- **Trunk space is smaller** than a standard 850i ( 10.6 cu. ft. vs. 15.5 cu. ft.) due to the **M-specific rear spoiler and exhaust**.

- **Seating is plush but not sporty** not ideal for track use without modifications.

6. **Depreciation & Market Saturation**

- While **M models hold value**, the **M850i is not as rare as older M models** (e.g., M850i xDrive from 2019 2020).

- **Newer models (2023 )** may have **updated tech**, making older units less appealing to some buyers.

---

### **Key Considerations Before Buying**

1. **Check for the Crankshaft Seal Issue**

- **Inspect the engine bay** for **oil leaks** around the **crankshaft rear cover**.

- **Review service history** has the **crankshaft seal or valvetronic system been serviced**?

- **BMW may offer a recall or warranty coverage** if the issue is confirmed (check **BMW s recall portal**).

2. **Test Drive & Listen for Unusual Noises**

- **Rough idling, ticking sounds, or oil burning smells** could indicate **valvetronic or oil system issues**.

- **Check for oil leaks** under the car after a drive.

3. **Budget for Maintenance**

- **Oil changes every 5,000 7,500 miles** (synthetic blend or full synthetic).

- **Transmission fluid changes** ( $200 $400 every 60,000 miles).

- **Brake system upgrades** (M models wear brakes faster).

4. **Consider Alternative Options**

- **Negotiate a lower price** (factoring in repair costs).

- **Look for a newer model (2023 )** that may have **fixed the issue**.

- **Explore a used M8 Competition** (if handling is more important).

---

### **Final Recommendation**

You **prioritize luxury, power, and prestige** over practicality.

The **seller provides proof** that the **crankshaft seal has been replaced** (or is under warranty).

You **budget for potential repairs** ( $1,000 $2,000 for the seal) and **maintenance costs**.

You **drive mostly on highways** and don t need extreme track performance.

You **find a well-maintained example** with **no oil leaks or valvetronic issues**.

The **crankshaft seal cover is leaking or has been previously replaced without warranty**.

You **cannot afford long-term maintenance** (fuel, tires, brakes, fluids).

You **prefer a more agile or practical luxury sedan** (e.g., **Audi A8, Mercedes S-Class, or Porsche Panamera**).

You **find a newer M850i (2023 )** that may have **fixed the issue** at a similar price.

- **Get a pre-purchase inspection (PPI)** from a **BMW specialist** ( $150 $250).

- **Verify service records** for **oil changes, transmission fluid, and valvetronic system checks**.

- **Negotiate aggressively** if the **crankshaft issue is present** (factor in repair costs).

- **Consider a lease** if you want **M850i ownership without long-term commitment**.

### **Conclusion**

The **2019 2025 BMW M850i is an incredible machine** for those who want **luxury, power, and exclusivity**, but the **crankshaft rear seal cover issue is a real concern**. If you **find a clean example with no leaks and proper maintenance history**, it can be a **fantastic buy**. However, if the **seal has failed or is at risk**, the **repair costs may outweigh the vehicle s value**. Always **inspect thoroughly, negotiate fairly, and budget for potential issues** before purchasing. For the best balance of **performance and reliability**, a **newer M850i (2023 )** may be the safer choice.

Details:

Please verify that it fits and is compatible with your specific model before purchasing. ENGINE: 4.4L V8 Twin Power Turbo. This is an item that has been previously used. DONOR VEHICLE: 2020 BMW M850iX G15 COUPE.

All parts including engines, transmissions, transfer cases, differentials, batteries come with a 30 day warranty. FREE SHIPPING is available for most items within the 48 states.

part #: 8483797 prices

• $30.24-$35.74

specifications cranshafengin:

• for models: M8
• for makes: Bmw
• for years: 2019-2025
• mpn: 8483797
• part type: Seal Cover Engine Crankshaft
• oe/oem part number: 11148483798 / 1114-8483798 / 1114-8-483-798
• items included: Rear Main Seal Retainer
• vintage part: No
• country of origin: Germany

payments cranshafengin:

• wallet: Google-pay
• credit card: Mastercard
• other

returns cranshafengin:

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

shipping cranshafengin:

• transit: 4-7 Days
• cost: $0.00
• service: Standard
• class: Standard
• type: Fixed

offer cranshafengin:

• options: Ship-to-home
• availability: In Stock
• best offers: True
• started: February 27, 2026
• quantity: 1
• sold: 0

seller cranshafengin:

• rating: 99.9%
• # reviews: 76203
• city: Traverse City, Michigan

general cranshafengin:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Crankshafts

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