1999 Pontiac Grand Am Is Leaking Oil

Identifying Common Causes of Oil Leaks in Your 1999 Pontiac Grand Am and How to Fix Them

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 1999 Pontiac Grand Am 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 1999 Pontiac Grand Am 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 steps should I take to diagnose the oil leak in my 1999 Pontiac Grand Am?

To effectively diagnose an oil leak in your 1999 Pontiac Grand Am, begin with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Start by locating the leak; inspect the area beneath your vehicle for any visible oil drips or stains, which can provide immediate clues. Next, check the oil level in the engine; a consistently low level may indicate a leak. Focus on the oil filter and drain plug, ensuring they are secure and free from damage, as these are common leak points. Examine the gaskets and seals, particularly the valve cover and oil pan gaskets, for signs of wear or damage. If the source remains elusive, consider using UV dye in the oil, which can illuminate the leak under a UV light after running the engine. For a more thorough investigation, a pressure test can help identify leaks within the oil system. If these steps do not yield results, seeking professional assistance is advisable, as experienced mechanics can provide the expertise and tools necessary for a comprehensive diagnosis and repair. By following this structured approach, you can efficiently identify and address the oil leak issue in your vehicle.

What are the common causes of oil leaks in a 1999 Pontiac Grand Am?

When dealing with oil leaks in a 1999 Pontiac Grand Am, it's essential to understand the common culprits that may be at play. One of the primary issues is worn valve cover gaskets, which can deteriorate over time, leading to oil seeping out. Additionally, the oil pan gasket is another frequent source of leaks, as it can degrade with age and allow oil to escape from the oil pan. A leaking oil filter, often due to improper installation or a defect, can also contribute to oil loss. Furthermore, inspect the oil pan itself for any signs of damage, as a compromised oil pan can lead to significant seepage. Lastly, don't overlook the oil drain plug; if it's loose or damaged, it can create a pathway for oil to leak. By identifying and addressing these common problems, DIYers can effectively manage oil leaks and maintain the performance of their Pontiac Grand Am.

How urgent is it to address the oil leak in a 1999 Pontiac Grand Am?

Addressing an oil leak in a 1999 Pontiac Grand Am is not just a matter of routine maintenance; it is a pressing concern that requires immediate attention. The urgency stems from the fact that oil leaks can significantly reduce oil levels, leading to inadequate lubrication of engine components. This lack of lubrication can result in increased friction, overheating, and ultimately, severe engine damage. Moreover, neglecting an oil leak can create hazardous conditions, as oil dripping onto hot engine parts poses a fire risk. Therefore, it is crucial for DIY enthusiasts to recognize the signs of an oil leak and take swift action to repair it. By doing so, you not only protect your vehicle's engine from costly repairs but also ensure your safety on the road.

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.

1999 Pontiac Grand Am Oil Leak Causes & Repair Costs