2020 GMC Yukon XL Is Leaking Oil

Address Oil Leaks in Your 2020 GMC Yukon XL Effectively

Find Repair Location
Reviewed by
Andrew Hajjar
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 2020 GMC Yukon XL 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 2020 GMC Yukon XL 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 diagnostic steps to identify the source of an oil leak in a 2020 GMC Yukon XL?

When tackling an oil leak in your 2020 GMC Yukon XL, start by thoroughly inspecting the vehicle to locate the leak's origin. Begin under the vehicle and around the engine, paying close attention to the oil pan area, as this is a common leak point. Next, check the oil level; a significant drop may indicate a serious leak that needs immediate attention. Inspect the oil filter and drain plug for any signs of looseness or leakage, as these components can often be the culprits. Additionally, examine the gaskets and seals, particularly the valve cover and oil pan gaskets, since they are frequent sources of oil leaks. Look for any oil stains or residue on the engine and surrounding components, which can provide clues about the leak's location. If the source remains elusive, consider adding UV dye to the engine oil; this can help you trace the leak more effectively using a UV light. By following these diagnostic steps, you can systematically identify and address the oil leak, ensuring your vehicle remains in optimal condition.

What are the common causes of oil leaks in a 2020 GMC Yukon XL?

When dealing with oil leaks in a 2020 GMC Yukon XL, it's essential to understand the common culprits that may be at play. One frequent issue is the degradation of the oil pan gasket, which can wear out over time, leading to leaks. Similarly, worn or damaged valve cover gaskets can fail to create a proper seal, allowing oil to escape. Another potential source of leaks is a faulty oil filter or drain plug; if either is loose or damaged, oil can leak from these points. Additionally, oil cooler lines may develop cracks due to wear and tear, contributing to leaks. Lastly, a leaking rear main seal, which seals the back of the crankshaft, can also be a significant source of oil loss. Addressing these issues promptly is crucial to prevent further engine damage, and regular maintenance checks can help you catch these problems early, ensuring your vehicle runs smoothly.

How urgent is it to address the oil leak in my 2020 GMC Yukon XL?

Addressing an oil leak in your 2020 GMC Yukon XL is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. An oil leak can lead to insufficient lubrication of the engine components, which increases friction and can cause severe engine damage over time. This not only jeopardizes the performance of your vehicle but can also result in costly repairs that could have been avoided with prompt action. Furthermore, a significant loss of oil can lead to dangerously low oil levels, increasing the risk of engine overheating and further wear and tear. Beyond the mechanical implications, neglecting an oil leak poses environmental risks, as leaking oil can contaminate soil and water sources, harming local ecosystems. Therefore, it is crucial to address any signs of an oil leak as soon as possible to protect both your vehicle's integrity and the environment, ensuring the longevity and reliability of your GMC Yukon XL.

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.