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Excessive Oil Consumption in my 2016 Encore 1.4L Turbo

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Mike T. · rep 0 · May 25, 2:48 AM · 1 replies · solved · Question

Vehicle: 2016 Buick Encore Preferred

I have a 2016 Buick Encore Preferred with the 1.4L turbo engine, and I've noticed it's burning through oil much faster than it should. I have to add a quart every 1,500-2,000 miles, which seems really high for a car with only 85,000 miles on it. There are no obvious leaks on my driveway.

I've heard that some 1.4L GM engines have issues with PCV systems or piston rings causing high oil consumption. Is this a known problem for the Encore, and what steps should I take to diagnose or fix it? Should I be worried about engine damage?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:48 AM

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  1. Understand the 1.4L Turbo Engine: The 1.4L LE2/LUJ Ecotec engine found in many 2016-2019 GM vehicles, including the Encore, is known to have issues with excessive oil consumption. This is often attributed to a faulty PCV (Positive Crankcase Ventilation) system design, leading to increased crankcase vacuum, which can pull oil past the piston rings or valve stem seals.
  2. Inspect the PCV System: A common failure point is the PCV valve or the diaphragm within the valve cover. A torn PCV diaphragm can cause excessive vacuum. You might hear a whistling sound from the engine bay, or experience a rough idle. Visually inspect the PCV hose and valve for cracks or blockages.
  3. Perform an Oil Consumption Test: The first step a dealership will likely recommend is an official oil consumption test. This involves draining your oil, refilling it, sealing the dipstick, and having you return after a certain mileage (e.g., 1,000-2,000 miles) to measure the actual consumption. This helps document the problem for warranty claims or repair decisions.
  4. Check for DTCs: While high oil consumption itself doesn't always trigger a direct OBD code, it can lead to secondary issues. A lean condition (P0171 - System Too Lean Bank 1) can occur if excessive oil vapor is burned, affecting air/fuel ratios. P0420 (Catalyst System Efficiency Below Threshold Bank 1) could also appear if oil burning is fouling the catalytic converter.
  5. When to See a Shop: Due to the complexity of diagnosing and repairing internal engine issues, it's crucial to take your Encore to a qualified mechanic or Buick dealership. If the PCV system is confirmed faulty, it might require replacing the valve cover (where the PCV diaphragm is integrated) or other engine components. In more severe cases, excessive oil consumption can lead to carbon buildup, spark plug fouling, and eventually catalytic converter damage. Address this promptly to prevent further engine wear.
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