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2018 Malibu 1.5L Turbo Excessive Oil Consumption & Smoke

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Mike T. · rep 0 · May 25, 1:39 AM · 1 replies · solved · Question

Vehicle: 2018 Chevrolet Malibu LT

Hello fellow Chevy owners, I'm reaching out about a problem with my 2018 Chevrolet Malibu LT, equipped with the 1.5L turbocharged engine. It's got around 75,000 miles on it.

I've noticed that I'm going through oil much faster than I should be. I have to add a quart every 1,500-2,000 miles, which seems excessive. Recently, I've also started seeing a puff of blue-ish smoke from the exhaust, especially on cold starts or when accelerating hard after idling.

I'm worried this could be a serious engine problem. Is this a known issue with the 1.5T engine in the Malibu? What should I be looking for or asking my mechanic to check?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:39 AM

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ClearTheCode admin answer:

Excessive oil consumption and blue smoke from the exhaust on your 2018 Chevrolet Malibu 1.5L Turbo are definite indicators of an engine issue, specifically that oil is being burned in the combustion chambers. This is a known concern for some small displacement turbocharged engines.

Common Causes:

  • PCV System Malfunction: A clogged or faulty Positive Crankcase Ventilation (PCV) valve or its associated hoses can lead to excessive crankcase pressure, forcing oil past seals and piston rings into the combustion chamber or turbocharger.
  • Turbocharger Seal Failure: The seals within the turbocharger can wear out, allowing engine oil to leak into the exhaust or intake side of the turbo, where it is then burned.
  • Piston Ring Issues: Worn or stuck piston rings are a significant cause of oil consumption. They fail to properly scrape oil from the cylinder walls, allowing it to burn during combustion.
  • Valve Stem Seals: Damaged valve stem seals can allow oil to leak down the valve guides into the combustion chamber, particularly noticeable on startup after the engine has sat.

Troubleshooting Steps:

  1. Inspect PCV Valve: Check the PCV valve and its hoses for clogs, cracks, or improper function. A simple test involves removing it and shaking it; it should rattle. If not, it might be stuck.
  2. Check for Oil Leaks: While blue smoke indicates burning, also check for external oil leaks around the engine, turbocharger, and exhaust connections.
  3. Turbocharger Inspection: A mechanic can inspect the turbocharger for shaft play and oil residue in the intake and exhaust pipes, indicating seal failure.
  4. Compression/Leak-Down Test: These tests can help diagnose internal engine wear, such as faulty piston rings or valve issues.

When to See a Shop:

It's crucial to have your Malibu inspected by a professional mechanic as soon as possible if:

  • Oil consumption continues at this rate or worsens.
  • The blue smoke becomes more consistent or heavier.
  • You hear any new engine noises.
  • Ignoring excessive oil consumption can lead to engine damage from low oil levels, fouled spark plugs, and catalytic converter damage due to oil ash buildup. Early diagnosis can prevent more costly repairs.
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