Cadillac CTS Is Leaking Oil

Discover the Common Causes of Oil Leaks in Your Cadillac CTS and How to Address Them Effectively

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Reviewed by
Bo Fader
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 Cadillac CTS 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 Cadillac CTS 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.

How to Diagnose and Fix Oil Leaks in a Cadillac CTS?

When tackling oil leaks in your Cadillac CTS, start with a thorough visual inspection to identify any obvious signs of leakage, such as oil spots on the ground or smoke from the engine. A full engine wash can help reveal the source of the leak; after cleaning, observe the engine for fresh oil accumulation, paying close attention to common leak points like the oil pressure switch and trans cooler lines. If you suspect the leak originates from the rear main seal or rear cover gasket, consult technical service bulletins for specific diagnostic and repair instructions. Once you've pinpointed the leak, proceed by draining the engine oil and retorquing the pan bolts to ensure a tight seal. Clean the mating surfaces of the oil pan and engine block, then apply a bead of silicone sealant to the seam, allowing it to cure overnight. Finally, refill the engine with oil only after the sealant has fully dried. Regularly checking your oil level and addressing leaks promptly is crucial to maintaining your vehicle's performance and preventing engine damage.

How to Diagnose and Fix Oil Leaks in a Cadillac CTS?

When tackling oil leaks in your Cadillac CTS, it's essential to understand the common problems that can arise within the engine's oil system. Frequent culprits include worn-out drain plugs, which can lead to slow drips, and damaged gaskets that may cause more significant leaks. Additionally, oil system component failures, such as a faulty oil filter or a compromised oil pan, can contribute to leaks. To effectively diagnose these issues, start by visually inspecting the engine and undercarriage for any signs of oil accumulation. If you notice oil drips or puddles, it’s a clear indication that further investigation is needed. For minor leaks, consider using an oil leak stopper, which can be added directly to the oil fill hole to temporarily seal small gaps. However, if the low oil light activates, it signals a more serious mechanical issue that requires immediate attention. Addressing these common problems promptly not only helps maintain your vehicle's performance but also prevents potential damage that could arise from prolonged oil leaks.

How to Address an Oil Leak in a Cadillac CTS?

Addressing an oil leak in your Cadillac CTS is not just a matter of convenience; it is a critical maintenance task that should be prioritized to avoid serious consequences. Ignoring an oil leak can lead to a range of issues, including engine overheating, reduced performance, and even catastrophic engine failure. The oil serves as a lubricant for various engine components, and a significant loss can compromise their functionality, leading to costly repairs. Moreover, oil leaks can create hazardous driving conditions, as leaking oil can make roads slippery and increase the risk of accidents. Therefore, it is essential to act swiftly upon noticing any signs of an oil leak. Regularly checking your oil levels and being vigilant about any unusual spots under your vehicle can help you catch leaks early. If you suspect a leak, take the time to identify its source and consider a DIY fix or consult a professional if the situation seems beyond your expertise. By addressing oil leaks promptly, you not only protect your Cadillac CTS but also ensure a safer driving experience.

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