OEM Oil Pan Assembly for 2006-2016 BMW 128i, 135i, 323i, 325i, 328i, 330i, 335i, 528i, Z4

What to Look For:

• Material: Ensure the oil pan is made of durable material, like steel or aluminum.
• Sealing Surface: Check that the sealing surface is smooth and free of imperfections to ensure a proper seal with the engine block.
• Drain Plug Threads: Inspect the drain plug threads for any damage or wear.
• Presence of Baffles: Some oil pans have internal baffles to prevent oil sloshing during hard cornering. If your original pan had baffles, make sure the replacement does too.

Quality Indicators:

• Precise Fit: The oil pan should fit perfectly against the engine block without any gaps.
• Durable Construction: Look for a pan made of thick, high-quality material that can withstand impacts and corrosion.
• Properly Welded Seams: If the pan is welded, ensure the seams are strong and free of leaks.

What's Typically Included:

• Oil pan
• Drain plug
• Oil pan gasket (sometimes included, sometimes sold separately)

Difficulty Level and Estimated Time:

• Difficulty: Moderate to Difficult.
• Estimated Time: 2-4 hours.

Special Tools Needed:

• Socket set
• Wrench set
• Torque wrench
• Jack and jack stands
• Oil drain pan
• Scraper
• Cleaning solvent

Critical Steps and Tips:

1. Drain the Oil: Completely drain the engine oil before removing the old oil pan.
2. Clean the Sealing Surface: Thoroughly clean the engine block sealing surface to remove any old gasket material or debris.
3. Install the Gasket: Install the new oil pan gasket according to the manufacturer's instructions.
4. Torque to Spec: Tighten the oil pan bolts to the specified torque using a torque wrench.
5. Refill with Oil: Refill the engine with the correct type and amount of oil.

DIY or Professional Installation:

• Due to the complexity and potential for leaks, professional installation is recommended, especially if you are not experienced with automotive repair. However, a mechanically inclined person with the right tools and knowledge can perform the job.

Here's a comparison of the oil pan options available:

Used OEM: Get a genuine factory oil pan at a significantly lower price. These parts are tested and inspected to ensure they meet quality standards.

Refurbished OEM: These are factory oil pans that have been professionally restored with new components, offering a reliable and cost-effective solution.

New Aftermarket: Brand new oil pans manufactured by third-party companies to meet or exceed OE specifications.

Parts Commonly Replaced or Checked:

• Oil pan gasket
• Oil drain plug and washer
• Oil filter
• Engine oil

Why Replace Related Parts:

• Replacing the oil pan gasket ensures a proper seal and prevents leaks.
• A new drain plug and washer prevent leaks from the drain plug.
• Replacing the oil filter and oil ensures the engine is properly lubricated with clean oil.
• Addressing all potential leak points at once minimizes the chance of repeat repairs.

How Long This Part Normally Lasts:

• An oil pan assembly can last for 100,000 miles or more under normal driving conditions.

Factors That Affect Longevity:

• Road conditions (exposure to debris and road salt)
• Driving habits (aggressive driving can increase stress on the engine)
• Maintenance schedule (regular oil changes help prevent corrosion)
• Climate (extreme temperatures can affect the oil pan gasket)

Budget vs Mid-Range vs Premium:

• Used OEM: $50 - $150
• Refurbished OEM: $100 - $250
• New Aftermarket: $80 - $300

Labor Cost Considerations:

• Labor costs for oil pan replacement can range from $200 to $500, depending on the mechanic's hourly rate and the complexity of the job.

Total Job Cost Estimates:

• Total cost (parts and labor) can range from $250 to $800 or more.

Known Issues:

• Some models are prone to oil leaks from the oil pan gasket due to the design of the engine block.
• Certain model years may experience corrosion issues with the oil pan due to the material used.

TSBs or Common Complaints:

• Check for any Technical Service Bulletins (TSBs) related to oil leaks or oil pan issues for your specific model year.
• Some owners have reported issues with aftermarket oil pans not fitting properly, so it's important to choose a reputable brand.

How to Confirm Proper Operation:

1. Check for Leaks: After installing the new oil pan, start the engine and let it run for a few minutes. Carefully inspect the oil pan and the surrounding area for any signs of oil leakage.
2. Monitor Oil Pressure: Check the oil pressure gauge or warning light on the dashboard to ensure the engine is maintaining proper oil pressure.
3. Listen for Unusual Noises: Listen for any unusual engine noises, such as knocking or ticking, which could indicate a problem with oil circulation.

What to Look/Listen For:

• No visible oil leaks.
• Normal oil pressure reading.
• No unusual engine noises.

FAQ

Q: How do I know if my oil pan is leaking or if it's something else?
A: Clean the area around the oil pan thoroughly. Then, check frequently for fresh oil drips. If you see oil accumulating near the oil pan, it's likely the source. Also, check your oil level regularly. A consistently dropping oil level can indicate a leak.

Q: Can I drive with a leaking oil pan?
A: It's not recommended. A leaking oil pan can lead to low oil levels, which can cause serious engine damage. It's best to address the problem as soon as possible.

Q: Is it difficult to replace an oil pan myself?
A: Replacing an oil pan can be challenging, especially if you don't have experience working on cars. It requires specific tools and knowledge of torque specifications. If you're not comfortable with the process, it's best to have a professional do it.

Q: What happens if I over-tighten the oil drain plug?
A: Over-tightening the oil drain plug can damage the threads in the oil pan, leading to leaks. It's important to use a torque wrench and tighten the drain plug to the specified torque.

Q: Will a new oil pan come with a new drain plug?
A: Sometimes. It depends on the manufacturer. Check the product description to see if a drain plug is included. If not, it's a good idea to purchase a new drain plug and washer to ensure a proper seal.

OEM Part Numbers:

• BMW: 11137552414

Fits Years: 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016