FORD FB5Z6079BSUB3 Dohc Rear Seal 2.0L

( Manufacturer Part Number: FB5Z6079BSUB3 ), ( Part Type: Seal ), ( Vintage Part: No ), ( Country Of Origin: United States )

Review FORD 2.0l Dohc Rear Main Seal Oem fits FOCUS 2005–2011

The **Ford FB5Z6079BSUB3 2005 2011 2.0L DOHC Rear Main Seal** is a precision-engineered component designed to provide a reliable, long-lasting seal for the rear crankshaft area in Ford s 2.0-liter Dual Overhead Camshaft (DOHC) inline-four engine, commonly found in the Focus, Fusion, and other models from 2005 through 2011. This high-quality seal is crafted from durable, oil-resistant elastomer materials, ensuring optimal performance under the demanding conditions of high-speed rotation, temperature fluctuations, and pressure variations inherent in modern automotive engines. The seal features a robust, interference-fit design with a reinforced lip and a precision-molded rubber compound that resists cracking, swelling, or degradation over time, even when exposed to fuel additives, lubricants, or extreme operating temperatures. Its smooth, low-friction surface minimizes wear on the crankshaft, reducing the risk of premature failure while maintaining a tight, leak-proof barrier against oil and coolant seepage. This seal is specifically engineered to fit the Ford FB5Z6079 engine block, offering a perfect match with the crankshaft journal and rear housing interface, eliminating gaps that could lead to oil leaks or contamination of the transmission fluid. Whether replacing a worn-out seal due to age, improper installation, or engine stress, this aftermarket part is built to meet or exceed OEM specifications, providing peace of mind for mechanics and DIY enthusiasts alike. Its compatibility with both manual and automatic transmission applications further enhances its versatility, making it an essential upgrade for maintaining engine integrity and preventing costly damage from oil leaks or crankshaft contamination.

### **Pros and Cons of Buying a Ford Focus 2.0L (FB5Z6079BSUB3, 2005 2011) with a Known Rear Main Seal Issue**

#### **Pros**

1. **Reliable Engine (When Maintained Properly)**

- The 2.0L Duratec (FB5) engine is a well-regarded inline-four, known for its smooth operation and decent power output (141 145 hp, depending on the year).

- With regular oil changes (every 5,000 7,500 miles) and proper maintenance, it can last well beyond 200,000 miles.

2. **Good Fuel Economy**

- The 2.0L engine typically achieves **22 28 MPG combined**, making it economical for daily driving compared to larger engines.

- Manual transmission models are slightly more efficient than automatics.

3. **Affordable Parts and Maintenance**

- Being a Ford Focus, parts are widely available and reasonably priced, especially for older models.

- Labor costs are generally lower than for newer vehicles, making repairs more budget-friendly.

4. **Decent Handling and Driving Experience**

- The Focus has a nimble, sporty feel, especially in manual transmission models, with good steering response.

- The suspension is tuned for a balanced ride, making it comfortable for both city and highway driving.

5. **Reliable Transmission (Manual More So)**

- Manual transmissions are extremely durable and rarely cause issues if maintained.

- Automatic transmissions (5-speed) are also reliable but may require more frequent fluid changes to avoid slippage or rough shifting.

6. **Proven Reliability in Other Areas**

- The Focus is known for having few major reliability issues outside of the rear main seal (RMS) and timing belt.

- The engine bay is well-designed, with easy access to key components like the timing belt, water pump, and alternator.

7. **Good Resale Value for Its Class**

- While not as valuable as newer models, a well-maintained Focus retains decent resale value compared to other compact cars of its era.

8. **Aftermarket Support**

- A large aftermarket exists for performance upgrades (intakes, exhausts, ECU tuning) and cosmetic modifications, allowing owners to customize the vehicle.

---

#### **Cons**

1. **Rear Main Seal (RMS) Failure Risk**

- The **most significant flaw** in these engines is the **rear main seal**, which can fail catastrophically, leading to **oil leaks, oil starvation, and potential engine damage**.

- Oil leaks from the rear of the engine (visible under the car or dripping onto the ground).

- Blue smoke from the exhaust (indicating oil burning in the combustion chamber).

- Ticking or knocking noises from the rear of the engine.

- **Replacement cost:** $800 $1,500 (parts labor), depending on the shop.

- **Prevention:** Regular oil changes and checking for leaks are crucial.

2. **Timing Belt and Water Pump Failure**

- The **timing belt** must be replaced every **60,000 100,000 miles** (Ford s recommendation is 60K, but many mechanics argue for 100K if using high-quality belts).

- The **water pump** is often replaced at the same time (as it s driven by the timing belt).

- **Failure consequences:** If the belt snaps, it can cause **valve damage**, leading to **expensive engine repairs (several thousand dollars)**.

- **Cost:** $400 $800 (parts labor).

3. **Automatic Transmission Issues (If Equipped)**

- Some **5-speed automatics** (especially in later models) have reported **slippage, rough shifting, or solenoid failures**.

- **Fluid changes** are critical using **Ford Type F or a high-quality synthetic alternative** helps prevent premature failure.

- **Replacement cost:** $1,500 $2,500 (transmission labor).

4. **Rust Susceptibility (Especially in Snowy Regions)**

- The Focus is prone to **rust in the wheel wells, rocker panels, and undercarriage**, particularly in areas with salted roads.

- A thorough inspection of the undercarriage is **essential** before purchase.

5. **Electrical and Sensor Problems**

- Some models have reported **issues with the mass airflow sensor (MAF), oxygen sensors, and alternators**.

- **Check Event Codes** (via OBD-II scanner) before buying to ensure no unresolved electrical issues.

6. **Interior Wear and Aging**

- Plastics in older Focus interiors can become brittle and crack over time.

- **Climate control and radio systems** may fail or require replacement after 10 years.

7. **Suspension Wear**

- **Shocks, struts, and bushings** wear out around **80,000 120,000 miles**, leading to a harsher ride.

- **Cost to replace:** $300 $800 per corner.

8. **Limited Modern Safety Features**

- Lacks **modern safety tech** like stability control (early models), side airbags (some trims), or advanced driver aids.

- **Airbags** may need replacement if deployed in an accident.

---

### **Conclusion**

The **2005 2011 Ford Focus with a 2.0L Duratec engine** is a **solid, reliable car** when **properly maintained**, particularly if you **prioritize oil changes, timing belt/water pump replacements, and rear main seal inspections**. It offers **good fuel economy, affordable parts, and a fun driving experience**, making it a great choice for **budget-conscious buyers** who are willing to **monitor and address common wear items**.

However, the **rear main seal issue is a major red flag** if the car has **visible oil leaks or signs of past seal failure**, it could lead to **expensive repairs**. **Always verify the service history**, especially for **oil changes and timing belt replacements**, before purchasing.

If you **find a well-documented example** with **no rear main seal leaks, a fresh timing belt, and a reliable transmission**, this Focus can be an **excellent long-term investment**. If you **discover major issues (e.g., blown RMS, neglected timing belt, or transmission problems)**, it may not be worth the risk unless you re prepared for **significant upfront repairs**.

---

### **Recommendation**

You **find a car with a clean service history** (oil changes every 5K 7.5K miles, timing belt replaced at 60K 100K miles).

The **rear main seal is intact** (no oil leaks, no blue smoke, no ticking noises).

The **transmission shifts smoothly** (especially if automatic).

You re **prepared for minor wear items** (shocks, bushings, sensors).

You **plan to drive it regularly** (not as a weekend cruiser).

The **rear main seal has failed or is leaking**.

The **timing belt is overdue** (or the water pump hasn t been replaced).

The **transmission has slippage or rough shifts**.

The **underbody has severe rust** that would require extensive repairs.

You **can t afford unexpected repairs** (even reliable cars need maintenance).

- **Get a pre-purchase inspection** from a **trusted mechanic** who specializes in Ford engines.

- **Check for oil leaks** under the engine and around the rear seal.

- **Inspect the timing belt and water pump** if they re due, **budget for replacement**.

- **Test drive and listen for unusual noises** (ticking, knocking, whining).

- **Review service records** if they re missing or incomplete, **proceed with caution**.

The **2005 2011 Ford Focus 2.0L is a great car for the right buyer** someone who **values reliability, fuel efficiency, and affordability** and is **willing to maintain it properly**. However, the **rear main seal risk means it s not a "set-and-forget" vehicle** **regular inspections are a must**. If you **find a well-cared-for example**, it can be an **excellent long-term purchase**. If you **ignore maintenance**, it could become a **money pit**.

Details:

This a brand new oem Ford rear main seal for 2.0 oboist and such engines make sure it fits your vehicle.

part #: fb5z6079bsub3 price

• $30.00

specifications cranshafengin:

• for models: Focus
• for makes: Ford
• for years: 2005-2011
• mpn: Fb5z6079bsub3
• part type: Seal
• vintage part: No
• country of origin: United States

offer cranshafengin:

• sold: 0
• quantity: 1
• started: March 28, 2026
• availability: In Stock
• options: Ship-to-home
• best offers: True

returns cranshafengin:

• policy: No Returns

payments cranshafengin:

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

shipping cranshafengin:

• transit: 4-9 Days
• class: Standard
• cost: $5.29
• service: USPS Ground Advantage
• type: Calculated
• carrier: USPS

seller cranshafengin:

• # reviews: 54
• city: Philadelphia, Pennsylvania
• rating: 100.0%

general cranshafengin:

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

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