2007 Mercury Mountaineer Is Leaking Oil

Discovering the Causes of Oil Leaks in Your 2007 Mercury Mountaineer and How to Fix Them Effectively

Find Repair Location
Reviewed by
Aisha
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 Mercury Mountaineer 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 Mercury Mountaineer 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.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

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 are the initial steps to diagnose the oil leak in a 2007 Mercury Mountaineer?

When diagnosing an oil leak in a 2007 Mercury Mountaineer, it's essential to adopt a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by locating the leak; inspect the ground beneath the vehicle for any oil spots, which can provide clues about the leak's origin. Next, turn your attention to the engine itself, looking for oil residue around critical areas such as the valve cover gasket, oil pan, and oil filter. Checking the oil level is also crucial, as a significant drop may indicate a serious leak. Don’t overlook the oil filter; a damaged or improperly installed filter can often be the culprit. Additionally, ensure that the oil drain plug is secure, as a loose plug can lead to leaks. Finally, inspect the oil pan gasket for any signs of wear or damage, as this can also be a common source of leaks. By following these steps, you can effectively narrow down the source of the oil leak and determine the necessary repairs.

What are the common causes of oil leaks in a 2007 Mercury Mountaineer?

When dealing with oil leaks in a 2007 Mercury Mountaineer, 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 leaks. Similarly, valve cover gaskets are prone to wear and can also result in oil escaping from the engine. Another area to inspect is the oil filter housing gasket, as failures here can cause oil to leak within the engine compartment. Additionally, the rear main seal, located at the back of the engine, can deteriorate and lead to significant oil leaks. Lastly, oil cooler lines are susceptible to leaks as well, which can manifest as oil seepage or drips beneath the vehicle. By regularly inspecting these components, DIYers can catch potential issues early, ensuring the longevity and performance of their Mountaineer while preventing further engine damage.

How urgent is it to address the oil leak in a 2007 Mercury Mountaineer?

Addressing an oil leak in a 2007 Mercury Mountaineer is an urgent matter that should not be overlooked. Ignoring the symptoms of an oil leak can lead to severe engine damage due to insufficient lubrication, which increases friction and heat within the engine components. This can escalate to engine failure, resulting in costly repairs that could have been avoided with timely intervention. Moreover, oil leaks pose safety risks, as oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Additionally, the environmental implications of oil leaks are significant; leaked oil can contaminate soil and water sources, contributing to pollution. Therefore, it is crucial to address any signs of an oil leak immediately to safeguard your vehicle's performance, ensure safety, and protect the environment.

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 Mercury Mountaineer Leaking Oil: Causes & Repair Costs