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Excessive Oil Consumption on 2017 Encore - What's Normal?

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Mike T. · rep 0 · May 22, 3:53 AM · 1 replies · solved · Question

Vehicle: 2017 Buick Encore Preferred

Hi all,

I own a 2017 Buick Encore Preferred with the 1.4L turbo engine, and I've noticed it's consuming a significant amount of oil between changes. I'm talking about adding a quart or more every 2,000-3,000 miles. I usually get my oil changed every 5,000 miles, and by that point, I'm often down 2-3 quarts.

There are no visible leaks on my driveway, and I don't see any excessive smoke from the exhaust. Is this level of oil consumption normal for these engines, or should I be looking into a specific problem? I've heard about PCV valve issues on some GM small engines. Could that be it?

Any advice on what to check or if this is something I should be worried about would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:53 AM

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Excessive oil consumption in the 1.4L turbo engine found in your 2017 Buick Encore is a known issue for some owners, and while some consumption is normal, adding a quart every 2,000-3,000 miles is generally considered high.

Common Causes for High Oil Consumption:

  1. PCV System Issues: The Positive Crankcase Ventilation (PCV) system is a primary suspect. A faulty PCV valve or a clogged PCV orifice can lead to excessive crankcase vacuum, pulling oil vapor into the intake manifold where it's burned off. This is a very common failure point on these engines.
  2. Turbocharger Seals: Worn turbocharger seals can allow oil to leak into the exhaust or intake side of the turbo, leading to burning oil without visible external leaks.
  3. Valve Stem Seals: Over time, valve stem seals can harden or wear, allowing oil to seep past them into the combustion chambers.
  4. Piston Rings: In more severe cases, worn or stuck piston rings can lead to oil blow-by and consumption.

What You Can Do (DIY & Diagnostics):

  • Monitor Oil Level Religiously: Keep a log of how much oil you add and when. This data is crucial for diagnosis.
  • Inspect PCV System: Check the PCV valve and hoses for cracks, clogs, or signs of oil residue. On some 1.4L engines, the PCV system is integrated into the valve cover, which may require replacing the entire valve cover if the PCV system fails.
  • Check for Leaks: Even if you don't see drips, check around the valve cover, oil pan, and turbocharger for any signs of seepage.
  • Observe Exhaust: While you don't see excessive smoke, pay attention during cold starts or heavy acceleration for any blue tint to the exhaust, which indicates oil burning.

When to See a Shop:

  • If you suspect a turbocharger issue, as this requires specialized diagnosis and repair.
  • If replacing the PCV valve (or valve cover) doesn't resolve the issue.
  • If you get a check engine light, especially codes like P0420 (Catalyst System Efficiency Below Threshold), which can sometimes be triggered by excessive oil burning damaging the catalytic converter.
  • For a compression test or leak-down test to assess the health of your piston rings and valve seals.
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