2019 Buick Encore Oil Leak Diagnosis: How to Identify Multiple Leaks and Avoid Costly Mistakes
Introduction
Oil leaks are one of the most common issues I see in the shop, but what trips people up—and even some technicians—is when there’s more than one leak happening at the same time. That’s exactly what we ran into on this 2019 Buick Encore.
At first glance, it looked like a straightforward oil pan leak. Oil was everywhere underneath the vehicle, especially around the bell housing area. But once we got it up in the air and took a closer look, the situation turned into a classic case of proper automotive troubleshooting.
This is a perfect example of why diagnosing car problems correctly matters. Misidentifying the source can easily lead to unnecessary repairs and wasted money.
Let’s walk through it step by step.
🔧 Recommended Tools for Diagnostics
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Autel MaxiSys MS906 Pro TS Professional OBD2 Scanner (with TPMS & full system diagnostics)
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Power Probe 3 (PP3CSRED) Circuit Testing Tool
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Power Probe ECT3000 Circuit Tracer (Short & Open Finder)
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Vehicle Overview
This vehicle is a 2019 Buick Encore, equipped with the 1.4L turbocharged engine. Mileage wasn’t excessive, but it had clearly seen enough use to start developing common leak issues associated with this platform.
The customer brought it in with a general complaint of an oil leak, noting oil spots under the vehicle and a burning oil smell after driving.
Vehicle Concern
The main concern was straightforward: oil leaking from the engine area, appearing to come from the oil pan region.
But as any experienced technician knows, where oil ends up is not always where it starts.
Initial Inspection & Observations
Once the vehicle was lifted, the first thing that stood out was how much oil was present underneath. The oil pan area was wet, and there was visible oil around the transmission bell housing.
That alone can easily mislead someone into thinking:
Oil pan gasket failure
Rear main seal leak
But before jumping to conclusions, I always trace the leak upward.
That’s where things got interesting.
Step-by-Step Diagnostic Process
The key to proper automotive troubleshooting is working from top to bottom. Gravity always wins, and oil always flows downward.
Step 1: Trace the Oil Path
Instead of focusing on where the oil collected, I followed the trail upward toward the front of the engine.
That’s when I found the first major clue.
Step 2: Identify the Primary Oil Source
The oil filter housing was heavily saturated with oil. Not just damp—completely coated. From there, oil was running down the front of the engine, across components, and eventually making its way back to the bell housing.
This is a classic leak pattern on the 1.4L turbo engine.
At this point, it became clear:
This was not an oil pan leak. It was an oil filter housing leak masquerading as something else.
Step 3: Check for Additional Issues
While inspecting the underside, I noticed something else—another fluid contamination.
The A/C compressor was coated in oil, and under UV light, it showed dye. That raised a second concern: a possible refrigerant oil leak.
But here’s where experience matters.
Just because you see oil on a component doesn’t mean it’s the source.
Step 4: Differentiate Between Leaks
This is where a lot of misdiagnosis happens.
Engine oil from the housing above could easily travel downward and coat the A/C compressor, making it look like a second failure.
However, the presence of dye suggested this might actually be an A/C system leak, not just contamination.
To be certain, the correct move would be:
Clean the compressor thoroughly
Recheck after running the system
Verify the exact origin of the dye
Even without that step completed yet, the evidence strongly suggested two separate issues.
Key Findings
After a thorough inspection, two distinct problems were identified:
Oil filter housing leak (primary engine oil leak)
Possible A/C compressor refrigerant oil leak (secondary issue)
The oil filter housing leak was confirmed based on location, saturation, and flow pattern.
The A/C compressor showed signs consistent with a refrigerant leak, though final confirmation would require cleaning and reinspection.
Final Diagnosis & Repair Recommendation
For the engine oil leak, the correct repair is:
Replace the oil filter housing assembly, including:
Housing
Cap
Filter
All associated O-rings and seals
These housings are known to fail and can warp over time, leading to persistent leaks.
For the A/C system:
Recommend A/C compressor replacement, but only after confirming the leak source.
If confirmed, proper repair should include:
Compressor replacement
System evacuation and recharge
Inspection of lines and seals
Replacement of receiver/drier if required
Skipping proper verification here can lead to unnecessary parts replacement, which is exactly what we’re trying to avoid.
Common Causes of This Problem
This situation highlights a few very common issues, especially on vehicles like the 2019 Buick Encore:
Oil filter housing gasket failure
Warped plastic housings due to heat cycling
Oil leaks traveling and misleading diagnosis
A/C system leaks at compressor seals or hose connections
These are exactly the kinds of symptoms that show up during real-world automotive troubleshooting.
Lessons for DIYers & Used Car Buyers
If you’re working on your own vehicle—or inspecting a used car—this is where attention to detail really pays off.
A few key takeaways:
Always trace leaks upward. Never assume the lowest point is the source.
Be cautious of multiple leaks. One issue can easily hide another.
Don’t rush to replace parts based on appearance alone. Confirm the failure.
During a used car inspection, look underneath. Fresh oil, wet components, or dye residue are red flags that shouldn’t be ignored.
This is how people end up buying vehicles that seem fine on the surface but have underlying issues that turn into expensive repairs later.
Don’t Get Burned on Your Next Used Car
If you’re thinking about buying a used car—or even if you already have one—this is exactly the kind of problem that can slip through the cracks and cost you big money later.
After 35+ years in the automotive field, I’ve seen firsthand how often people end up with vehicles that have hidden issues just like this.
That’s why I put together a simple Used Car Guide to help you understand what to look for and how to avoid making a costly mistake.
It’s a quick, practical guide designed to give you the right mindset and approach before you buy.
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It’s a smart first step toward making a better used car decision.
Disclaimer: Some of the links in this post may be affiliate links, which means I may earn a small commission if you purchase through them—at no additional cost to you. I only recommend tools and products that I personally use or trust in real-world diagnostics.
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