2007 Buick LaCrosse Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2007 Buick LaCrosse and How to Fix Them Effectively

Find Repair Location
Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a 2007 Buick LaCrosse is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2007 Buick LaCrosse is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Oil pans don't wear out or break like other parts, they generally only need to be replaced because of external damage from an accident or an improperly tightened drain plug. The main symptom you will experience is an oil leak underneath the engine of your car. The oil that leaks from a damaged oil pan will range from dark brown to dark black. If the leak is large enough or occurs for long enough the oil level will be low enough to turn the oil pressure or low oil level warning light on.

A bad oil level sensor may cause a false reading of the engine oil level. The oil level warning light may illuminate even when the oil level (checked manually) is within an acceptable range. The warning light may also come on and off intermittently if the sensor is faulty. An error code may be sent to the PCM and a check engine light may come on the dashboard as well if the sensor is bad.

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What steps should I take to diagnose the oil leak in my 2007 Buick LaCrosse?

To effectively diagnose an oil leak in your 2007 Buick LaCrosse, start by investigating the leak itself. Place a white paper or cardboard under your vehicle to catch any dripping fluid, which will help you identify the color and type of fluid, confirming whether it is indeed oil. Next, conduct a thorough visual inspection of the engine and surrounding areas for any signs of external leaks, as oil can sometimes escape without leaving noticeable spots on the ground. Once you have identified the leak's location, you can determine the source, whether it be a faulty gasket, a damaged seal, or another component. Depending on your findings, you may need to repair or replace the affected parts. In some cases, resealing the gasket surfaces may be necessary to prevent future leaks. By following this diagnostic approach, you can address the oil leak effectively, ensuring your vehicle remains in good working condition.

What are the common causes of oil leaks in a 2007 Buick LaCrosse?

When dealing with oil leaks in a 2007 Buick LaCrosse, it's crucial to understand the common culprits that may be at play. One frequent issue is the deterioration of the oil pan gasket, which can wear out over time and lead to significant leaks. Similarly, valve cover gaskets are prone to wear and can also result in oil escaping from the engine, creating a mess and potential engine damage. Another area to inspect is the oil filter housing gasket; if this seal fails, it can cause oil to leak within the engine compartment, making it essential to check during routine maintenance. Additionally, the rear main seal, located at the back of the engine, can deteriorate and lead to leaks that are often more challenging to address. Lastly, oil cooler lines can develop leaks as they age, contributing to oil seepage in the engine bay. By being aware of these common issues, DIY enthusiasts can take proactive steps to inspect and repair oil leaks, ensuring their Buick LaCrosse remains in optimal condition. Regular maintenance and timely inspections are key to preventing more severe engine problems down the line.

How urgent is it to address the oil leak in a 2007 Buick LaCrosse?

Addressing an oil leak in your 2007 Buick LaCrosse is not just a matter of routine maintenance; it is a pressing issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the lubrication of vital engine components. This lack of lubrication increases friction and wear, potentially resulting in severe engine damage that could be costly to repair. Moreover, the presence of leaking oil poses a serious fire hazard, especially if it comes into contact with hot engine parts, creating a risk that could endanger both the vehicle and its occupants. Additionally, neglecting this issue can have environmental repercussions, as spilled oil can contaminate soil and water sources, contributing to pollution. Therefore, if you notice any signs of an oil leak, it is crucial to act swiftly to mitigate these risks and ensure the longevity and safety of your vehicle.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2007 Buick LaCrosse Oil Leak Causes & Repair Costs