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Excessive Oil Consumption in 2016 GMC Terrain 2.4L

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Mike T. · rep 0 · May 25, 2:42 AM · 1 replies · solved · Question

Vehicle: 2016 GMC Terrain SLT 2.4L

Hey fellow GMC owners,

I've got a 2016 GMC Terrain SLT with the 2.4L Ecotec engine, and I've noticed it's burning through oil at an alarming rate. I seem to be adding a quart or more every 1,000-1,500 miles, sometimes even less. There are no visible leaks on my driveway, and I don't see any blue smoke from the exhaust, at least not consistently.

This is really concerning, and I've heard that some 2.4L engines had issues with oil consumption. Is this a known problem for my model year? What could be causing this, and what are my options for fixing it? I want to make sure I'm not doing any long-term damage to the engine.

Any advice from those who've dealt with this would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:42 AM

0

ClearTheCode admin answer:

Excessive oil consumption in the 2.4L Ecotec engine, particularly in model years around 2010-2017, is a widely recognized issue for GM vehicles, including your 2016 GMC Terrain. This problem often stems from specific design flaws that lead to oil being burned in the combustion chambers.

Common Causes:

  1. Piston Ring Design: The primary cause is often related to poorly designed piston rings that fail to adequately scrape oil from the cylinder walls, leading to oil entering the combustion chamber and burning off.
  2. PCV System Issues: A faulty PCV (Positive Crankcase Ventilation) valve or a clogged PCV system can contribute to increased crankcase pressure, forcing oil past the piston rings or valve seals.
  3. Valve Guide Seals: Worn or hardened valve guide seals can also allow oil to seep into the combustion chamber.

Steps for Resolution:

  1. Oil Consumption Test: The first step a dealership will typically perform is a formal oil consumption test. This involves topping off the oil, sealing the dipstick/fill cap, and having you return after a specified mileage (e.g., 1,000-1,500 miles) to measure the consumption. This is crucial for warranty claims or extended coverage.
  2. PCV System Inspection: Have the PCV valve and associated hoses inspected for clogs or failures. Replacing a faulty PCV valve is a relatively inexpensive first step.
  3. Engine Rebuild/Replacement (Piston Rings): If the oil consumption test confirms excessive use, the most common long-term solution involves replacing the pistons and piston rings with an updated design. This is a significant engine repair, often involving a partial engine rebuild. In severe cases, a full engine replacement might be recommended.
  4. Software Updates: In some instances, engine control module (ECM) software updates were released to modify fuel delivery or spark timing, hoping to mitigate the issue, though this is less effective for severe mechanical consumption.

When to See a Shop:

  • Immediately, if you are adding oil regularly. Continued low oil levels can lead to severe engine damage, including bearing failure or timing chain issues.
  • While there might not be specific OBD-II codes directly for 'oil consumption,' persistent low oil can trigger codes like P0300 (Random/Multiple Cylinder Misfire Detected) due to fouled spark plugs, or P0420 (Catalyst System Efficiency Below Threshold) due to oil burning damaging the catalytic converter.
  • Contact a GMC dealership to inquire about any extended warranty programs or special coverages (sometimes referred to as 'Customer Satisfaction Programs') related to the 2.4L Ecotec oil consumption, as GM has offered these in the past for affected vehicles.
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