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High Oil Consumption in My 2021 Buick Envision 2.0T

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Mike T. · rep 0 · May 22, 3:54 AM · 1 replies · solved · Question

Vehicle: 2021 Buick Envision Avenir

Hi all,

I've got a 2021 Buick Envision Avenir with the 2.0T engine, and I'm concerned about its oil consumption. I seem to be adding about a quart of oil every 2,000 to 2,500 miles, which feels excessive for a relatively new car. There are no visible leaks on my driveway.

Is this normal for the 2.0T engine in the Envision, or should I be worried? What could be causing this, and what steps should I take? I'm trying to figure out if this is something I need to address under warranty.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:54 AM

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ClearTheCode admin answer:

High oil consumption in modern turbocharged engines, including the 2.0T in your 2021 Buick Envision Avenir, can be a complex issue. While some oil consumption is considered normal by manufacturers, a quart every 2,000-2,500 miles is on the higher side and warrants investigation, especially for a newer vehicle.

Here are the common causes and steps to take:

  1. PCV System Issues: The Positive Crankcase Ventilation (PCV) system is designed to vent crankcase gases. If components like the PCV valve or associated hoses are clogged or faulty, it can lead to excessive oil being drawn into the intake manifold and burned.
  2. Turbocharger Seals: The turbocharger operates at high temperatures and speeds. Worn or failing turbocharger seals can allow oil to leak into the exhaust or intake side of the turbo, leading to it being burned off. You might notice blue smoke from the exhaust, especially on acceleration, though it can be subtle.
  3. Piston Rings/Valve Seals: In more severe cases, worn piston rings or valve stem seals can allow oil to enter the combustion chamber. This is less common in a 2021 model but not impossible.
  4. Oil Viscosity: Ensure you are using the correct oil viscosity specified in your owner's manual. Using an incorrect or lower quality oil can sometimes contribute to higher consumption.
  5. Driving Habits: Aggressive driving, frequent short trips, or prolonged idling can sometimes contribute to increased oil consumption.

What to Do:

  • Start an Oil Consumption Test: Your Buick dealership can initiate an official oil consumption test. This involves draining your oil, refilling it, sealing the dipstick, and having you return after a specified mileage (e.g., 1,000-1,500 miles) for them to measure the consumption. This is crucial for warranty claims.
  • Check for TSBs: Ask the dealership if there are any Technical Service Bulletins related to oil consumption for your specific engine and model year.
  • Look for OBD-II Codes: While not directly for oil consumption, excessive oil burning can sometimes lead to a P0420 (Catalyst System Efficiency Below Threshold) code due to oil fouling the catalytic converter.

When to See a Shop: Given your vehicle is a 2021 model, it should still be under warranty. Schedule an appointment with your Buick dealership immediately to start an official oil consumption test. This documentation is vital for any potential warranty repairs.

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