1259525 BMW Engine Block Up E3 M30

Review BMW 75-78 6cyl Engine Block Local Pick Up Only 3.2e for E3 M30

The BMW E3 engine, specifically the M30 3.0Si 6-cylinder block with the part number 1259525 and production years ranging from 1975 to 1978, is a masterpiece of automotive engineering. This engine block is a significant component of the BMW 3.0-liter straight-six powertrains, known for their balance, power, and efficiency.

The M30 3.0Si engine block is made of high-strength aluminum alloy, ensuring lightweight yet robust construction. This particular block is designed for use with the 3.0-liter, 6-cylinder, naturally aspirated engine, featuring a bore size of 84.0 mm (3.31 inches) and a stroke length of 80.0 mm (3.15 inches), resulting in a total displacement of approximately 2986 cc (181.5 cubic inches).

The combustion chamber design in this engine block is a pressured-piston, hemispherical combustion chamber, which delivers excellent fuel-air mixture distribution for optimal combustion efficiency. The block itself is precision-machined with various features such as water jackets, oil passages, and mounting surfaces for various engine components.

The engine block is equipped with a wet sump oiling system, which uses an oil pan to maintain oil pressure and provide lubrication for the engine's moving parts. The oil pump is mounted on the crankshaft, and the oil filter is conveniently located in the engine block near the oil pan.

The cooling system in this engine block consists of water jackets that surround the cylinders and other critical engine components. The coolant enters the block through the water pump and circulates through the jackets, absorbing the heat generated during combustion. The coolant then exits the block and is recirculated back to the water pump for further cooling.

The M30 3.0Si engine block is a testament to BMW's commitment to engineering excellence. Its robust construction, superior cooling, and efficient oiling system make it a highly desirable component for enthusiasts and BMW restorers. Whether you're rebuilding an engine or sourcing a replacement, this BMW M30 3.0Si 6-cylinder engine block is an outstanding choice.

Buying a BMW E3 3.0si M30 6-cylinder engine block with the part number 1259525 and production years between 75-78 can be a significant investment for BMW enthusiasts or mechanics. Here are some potential pros and cons to consider before making a purchase.

1. OEM (Original Equipment Manufacturer) Part: Purchasing an OEM engine block ensures that the part is a direct fit for your BMW E3 model, reducing the likelihood of compatibility issues.

2. Durability and Reliability: BMW engines are known for their durability and reliability. An OEM engine block can provide long-term performance and minimize the need for frequent repairs.

3. Improved Performance: Depending on the condition of your existing engine block, upgrading to a new one could lead to improved performance and power output.

1. Cost: BMW parts, especially OEM parts, can be quite expensive. The cost of the engine block may be a significant investment for some.

2. Availability: Depending on the availability of the specific engine block you're looking for, there could be a waiting period before it arrives.

3. Installation Complexity: Installing a new engine block can be a complex process, requiring specialized tools and knowledge. Professional installation may add to the overall cost.

Ultimately, whether or not to buy a BMW E3 3.0si M30 6-cylinder engine block with the part number 1259525 depends on several factors, including the current condition of your existing engine block, the availability of the part, your budget, and your willingness to invest time and resources into the installation process. If you're looking for a long-term solution, an OEM engine block could be a worthwhile investment, while those on a tighter budget or with a less complex engine issue may want to consider alternative solutions.

Before making a decision, it's recommended that you consult with a BMW mechanic or specialist to assess the condition of your existing engine block and determine if an engine block replacement is the best solution for your specific situation. They can provide valuable insights into the potential benefits and costs associated with the upgrade and help you make an informed decision.

Details:

Please refer to pictures for item condition.

specifications engineblocksam:

• for models: E3, M30
• brand: Bmw
• mpn: 1259525
• type: Engine Block
• manufacturer warranty: 60 Day
• fitment type: Direct Replacement
• material: Steel

seller engineblocksam:

• rating: 100.0%
• city: east setauket, new york
• # reviews: 20671

offer engineblocksam:

• in stock #: 1
• started: january 22, 2026
• best offers: true
• sold #: 10
• price: $250.00
• item condition: Used
• options: seller-arranged-local-pickup
• availability: in stock

payments engineblocksam:

• wallet: google-pay
• other
• cash
• credit card: visa

shipping engineblocksam:

returns engineblocksam:

• time: 30 days
• policy: returns accepted
• paid by: buyer

general engineblocksam:

• category: Auto Parts > Car Truck Accessories > Engines > Blocks