2018 Chevrolet Silverado 3500 HD Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your 2018 Chevrolet Silverado 3500 HD and How to Fix Them

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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 2018 Chevrolet Silverado 3500 HD 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 2018 Chevrolet Silverado 3500 HD 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 and fix the oil leak in my 2018 Chevrolet Silverado 3500 HD?

To effectively diagnose and fix an oil leak in your 2018 Chevrolet Silverado 3500 HD, start with a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Begin by locating the leak; inspect the undercarriage for any visible oil spots, focusing on common leak areas such as the oil pan, oil filter, and valve cover gaskets. Once you identify the source, check the oil levels to ensure they are adequate, as low oil can exacerbate engine issues. Next, carefully examine the gaskets and seals for wear or damage, as these are often culprits in oil leaks. If you find loose components, such as a drain plug, tightening them may resolve the issue. For damaged gaskets, replacement is necessary. After making repairs, clean the engine area to eliminate old oil residue, which will help you spot any new leaks. Finally, monitor the vehicle over the next few days to confirm that the leak has been successfully addressed. This methodical approach not only aids in resolving the current issue but also helps maintain the overall health of your vehicle.

What are the common causes of oil leaks in a 2018 Chevrolet Silverado 3500 HD?

When diagnosing oil leaks in a 2018 Chevrolet Silverado 3500 HD, it's crucial to understand the common culprits that may be at play. One frequent issue is a worn or damaged oil pan gasket, which can deteriorate over time and lead to significant oil loss. Similarly, valve cover gaskets are prone to wear, and their failure can result in oil seeping from the engine. Another area to inspect is the oil filter housing gasket; if this component fails, it can create a noticeable leak. Additionally, the rear main seal, located at the back of the engine, is another potential source of oil leaks, as it can develop wear and tear over time. Lastly, oil cooler line leaks can occur, particularly if the lines are corroded or improperly secured. Addressing these issues promptly is essential not only for maintaining engine performance but also for preventing further damage. Regular inspections and timely repairs can help keep your Silverado running smoothly and efficiently.

How urgent is it to address the oil leak in my 2018 Chevrolet Silverado 3500 HD?

Addressing an oil leak in your 2018 Chevrolet Silverado 3500 HD 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 essential engine components. This lack of lubrication can result in severe engine damage over time, leading to costly repairs that could have been easily avoided. Furthermore, an oil leak increases the risk of engine overheating, as insufficient oil can prevent proper cooling, potentially resulting in catastrophic engine failure. Beyond mechanical concerns, there are safety implications to consider; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Therefore, it is crucial to address any signs of an oil leak promptly to maintain the performance and safety of your Chevrolet Silverado 3500 HD. Taking swift action not only protects your investment but also ensures a safer driving experience.

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