BMW Driver Left Cylinder Head Dohc 306-59307L

( Part Type: Driver Cylinder Head ), ( Conditions Options: Efi, Factory ), ( Genuine Oem: Yes ), ( Ipn: 306-59307l ), ( Placement: Driver/left )

Review BMW Driver Left Cylinder Head Dohc fits 545I 2004–2005

The **BMW 306-59307L Driver-Side Cylinder Head (DOHC) for the 2004-2005 E46 545i** is a precision-engineered component designed to deliver the high-performance reliability expected from BMW s legendary inline-six architecture. This cast aluminum head, part of the M52TU engine family, features a dual overhead camshaft (DOHC) configuration with four valves per cylinder, ensuring optimal airflow for enhanced combustion efficiency and power output. The head is meticulously machined with high-tolerance intake and exhaust ports, allowing for improved cylinder filling and exhaust scavenging, which contributes to the 545i s signature smooth yet spirited performance. The driver-side head is equipped with a robust valve cover, complete with a gasket surface and mounting points for secure installation, while the integrated rocker arm assemblies and pushrod guides ensure precise valve actuation. This component is compatible with the 3.0-liter M52TU engine, which powers the 545i with its twin-scroll turbocharged setup, delivering a balanced blend of torque and responsiveness. Whether replacing a worn or damaged head due to overheating, warping, or internal wear, this aftermarket or OEM-quality part is designed to restore factory performance while maintaining the engine s structural integrity. Built to meet BMW s stringent engineering standards, it includes all necessary hardware for a straightforward installation, making it an ideal choice for enthusiasts and mechanics seeking to preserve or restore the iconic driving dynamics of the E46 545i.

### **Pros and Cons of Buying a BMW 325i (E46) 59307L (Left-Hand Drive, DOHC, 04-05 Model Year) with a Rebuilt Cylinder Head**

#### **Pros**

1. **Reliability with a Rebuilt Cylinder Head**

- The most significant advantage is that the cylinder head has been professionally rebuilt (59307L code indicates a head replacement). This means major issues like warping, leaks, or internal damage have been addressed, reducing the risk of catastrophic engine failure.

- A rebuilt head often comes with new seals, gaskets, and possibly upgraded components (e.g., new valves, springs, or a fresh valve job), improving long-term durability.

2. **Strong Engine Performance**

- The M54 engine (installed in 04-05 325i models) is a well-regarded inline-six with good power (204 hp in the base model, 231 hp in the 325i with the M54B25 engine). It offers a balanced mix of torque and responsiveness, making it enjoyable for both city and highway driving.

- The DOHC (Dual Overhead Camshaft) design ensures good breathing and efficiency, which helps maintain performance over time if properly maintained.

3. **Proven BMW E46 Platform**

- The E46 chassis (1998 2006) is one of BMW s most reliable and well-documented generations. With proper maintenance, many E46s easily exceed 200,000 miles.

- The 325i is less performance-oriented than higher-tier models (e.g., M3), so it s less prone to excessive wear from aggressive driving.

4. **Aftermarket Support and Customization**

- The E46 has a vast aftermarket, including performance parts (e.g., intake manifolds, exhaust systems, ECU tuning), cosmetic upgrades, and suspension modifications.

- Tuning options like MHD or Haltech can unlock additional power (e.g., 250 hp) if desired, making it a fun project car or daily driver with potential.

5. **Resale Value and Collectibility**

- While not as valuable as an M3 or Z3, the E46 325i retains decent resale value, especially in lower-mileage or well-maintained examples. Some enthusiasts seek out specific trims (e.g., LCI facelift models from 2004 onward) for their styling.

- The 04-05 models are part of the "LCI" (Lightweight Concept Interior) update, which included minor improvements like revised dash panels and door cards, adding to their appeal.

6. **Fuel Efficiency**

- The M54 engine is relatively efficient for its class, averaging around **18 22 MPG combined** (city/highway), which is better than many contemporary V8 or turbocharged engines of the era.

7. **Driving Experience**

- The E46 325i offers a well-balanced driving experience with precise steering, a comfortable ride, and a smooth transmission (especially with the ZF 5-speed automatic or Getrag 6-speed manual).

- The interior is spacious and well-appointed for its time, with good sound insulation and a solid build quality.

---

#### **Cons**

1. **Aging Transmission (If Automatic)**

- The ZF 5-speed automatic (common in 04-05 models) is known for being less refined than BMW s later transmissions. It can be sluggish in traffic and prone to rough shifts if not well-maintained.

- Manual transmissions (Getrag 6-speed) are more reliable and engaging but require more driver involvement.

2. **Electrical Gremlins**

- Like many BMWs of this era, the E46 can suffer from electrical issues, such as faulty sensors, wiring harness problems, or intermittent problems with the infotainment system (if equipped).

- Common culprits include the **fuse box, ABS module, or central locking system**, which may require diagnostics and repairs.

3. **Rust and Corrosion Risks**

- The E46 is prone to rust, particularly in the **wheel wells, rocker panels, and undercarriage**. A thorough inspection of the chassis and underbody is essential, especially if the car has seen salt exposure or poor storage.

- Some models may have **popped rivets** (common in early E46s), which can lead to water leaks into the cabin.

4. **Maintenance Costs**

- **Timing belt replacement** (every 60,000 100,000 miles, depending on model year).

- **Spark plugs** (every 30,000 40,000 miles).

- **Cooling system flushes** (every 3 5 years to prevent corrosion).

- **Fuel system cleaning** (to prevent injector fouling, common in older BMWs).

- Labor costs for BMW work can be high, especially if using a dealership.

5. **Suspension Wear**

- The E46 s suspension (struts, bushings, control arms) can wear out over time, leading to a harsher ride or handling issues. Replacing worn components improves comfort and safety.

- **Power steering fluid leaks** are also common, often requiring a new pump or hoses.

6. **Potential Hidden Issues**

- Even with a rebuilt head, other engine components (e.g., **camshafts, lifters, or oil pump**) could be worn. A **compression test** or **leak-down test** is advisable to ensure the engine is in good health.

- **Exhaust manifold cracks** (especially on the passenger side) can occur, leading to leaks and reduced performance.

- **Water pump failure** is a known issue in some M54 engines, which can cause overheating if not addressed.

7. **Fuel System Challenges**

- The M54 s **fuel injectors** can clog over time, leading to rough idling or misfires. A **fuel system cleanout** (e.g., with Seafoam or BMW-specific cleaners) may be needed.

- **Fuel pump reliability** varies; some pumps fail prematurely, requiring replacement.

8. **Limited Modern Safety Features**

- Compared to today s standards, the E46 lacks **modern safety tech** like stability control, advanced airbag systems, or electronic braking assistance. However, the car is still safe by its era s standards.

9. **Parts Availability and Cost**

- While parts are widely available, **replacement costs can add up**, especially for rare or high-quality components (e.g., OEM suspension parts, wiring harnesses).

- Some aftermarket parts may not fit perfectly, requiring modifications.

10. **Depreciation**

- The E46 has already depreciated significantly, but further value loss is possible if the car isn t well-maintained. It s not a long-term investment but a **fun, reliable daily or project car**.

---

### **Ending Conclusion**

Buying a **2004 2005 BMW 325i (E46) with a rebuilt cylinder head (59307L)** is a **smart choice for enthusiasts** who prioritize **driving enjoyment, reliability, and aftermarket potential** over modern luxury or cutting-edge tech. The rebuilt head mitigates one of the E46 s biggest weaknesses (head failure), making the engine a more dependable powerplant. The M54 engine is **strong, efficient, and capable of handling modifications**, while the E46 s chassis offers a **balanced mix of comfort and performance**.

However, **buyers must be prepared for potential electrical quirks, rust issues, and maintenance costs**. A **thorough pre-purchase inspection** (including a **compression test, leak-down test, and undercarriage check**) is **critical** to avoid hidden problems. If maintained properly, this car can be a **fantastic daily driver, track car, or project car** with years of enjoyable ownership ahead.

---

### **Recommendation**

- You want a **fun, reliable BMW with strong aftermarket support**.

- You re comfortable with **regular maintenance** (timing belt, fuel system, suspension).

- The car has **documented head work** (preferably by a reputable shop) and **low miles** (under 100,000 is ideal).

- You plan to **inspect it thoroughly** (or have a trusted mechanic do so) before purchasing.

- You re okay with **some electrical quirks** and **aging interior features**.

- You expect **dealership-level reliability** without extra effort.

- You re not prepared for **potential rust or suspension wear**.

- You want a **luxury or tech-focused** car (modern BMWs or Audis may be better).

- The seller **cannot provide service records** or the head rebuild was done by an untrusted shop.

This **04-05 325i with a rebuilt head is a great choice for BMW enthusiasts** who value **driving dynamics, mod potential, and long-term reliability** as long as due

Details:

Some heads may need to be resurfaced. Cylinder Heads are not sold with the valve covers. No expedited shipping is available. No time to stop in.

We draw on more than 30 years of experience, and no part is too big or small to carry. Note: This is a USED head NOT new.

part #: 545i prices

• $159.89-$699.00

specifications cylinderheapar:

• for models: 545i
• for makes: Bmw
• for years: 2004-2005
• part type: Driver Cylinder Head
• conditions options: Efi, Factory
• genuine oem: Yes
• ipn: 306-59307l
• placement: Driver/left

general cylinderheapar:

• Car Truck Parts Accessories > Engines Engine Parts > Cylinder Heads
• condition: Used

returns cylinderheapar:

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

offer cylinderheapar:

• availability: In Stock
• best offers: True
• sold: 0
• options: Ship-to-home
• started: March 14, 2026
• quantity: 1

shipping cylinderheapar:

seller cylinderheapar:

• rating: 100.0%
• city: Tucson, Arizona
• # reviews: 2251

payments cylinderheapar:

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

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