The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

Is Excessive Oil Consumption Normal for a 2019 Terrain 1.5L Turbo?

0

Eric V. · rep 0 · May 22, 3:47 AM · 1 replies · solved · Question

Vehicle: 2019 GMC Terrain SLT (1.5L Turbo)

Hi everyone,

I own a 2019 GMC Terrain SLT with the 1.5L turbocharged engine, and I've noticed it's consuming a significant amount of oil. I'm having to add about a quart every 2,000-3,000 miles, sometimes even sooner. There are no visible leaks on my driveway, and I don't see any smoke from the exhaust.

The car has about 70,000 miles on it now, and I've been diligent with oil changes using the recommended synthetic oil. This seems excessive for a relatively modern engine. I'm worried about potential long-term damage.

Is this level of oil consumption considered 'normal' for this particular engine, or should I be concerned? What could be causing it, and what steps should I take?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:47 AM

0

ClearTheCode admin answer:

  1. Address the Concern: Excessive oil consumption in modern engines, especially turbocharged ones like your 2019 GMC Terrain's 1.5L, is a legitimate concern and generally not considered 'normal' at the rate you're describing (a quart every 2,000-3,000 miles).

  2. Common Causes for Oil Consumption:

    • PCV System Issues: A faulty Positive Crankcase Ventilation (PCV) valve or system can lead to increased oil consumption by allowing oil vapor to be drawn into the intake manifold and burned.
    • Turbocharger Seals: The turbocharger operates at high temperatures and speeds. Worn or failing seals within the turbo can allow oil to leak into the exhaust or intake, where it's burned off without visible external leaks.
    • Piston Rings: Worn or stuck piston rings can fail to properly scrape oil from the cylinder walls, leading to it being burned during combustion. This is a more serious internal engine issue.
    • Valve Stem Seals: Damaged valve stem seals can allow oil to seep past the valves and into the combustion chamber.

  3. Diagnostic Steps & TSBs:

    • Oil Consumption Test: The first step a GMC dealership or reputable mechanic will perform is an official 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 actual consumption.
    • Check for TSBs: GM has had various TSBs related to oil consumption on different engines. Inquire if any apply to your 1.5L LTG engine in the 2019 Terrain. These might suggest specific diagnostic procedures or repairs.
    • PCV System Inspection: A technician can inspect the PCV system for blockages or failures.
    • Compression/Leak-Down Test: If the consumption test confirms an issue, further engine diagnostics like compression and leak-down tests can help pinpoint internal engine wear.

  4. When to See a Shop:

    • Immediately: Schedule an appointment with a GMC dealership or a trusted independent mechanic. Document your oil additions (dates, mileage, amount) to provide to the technician.
    • Preventative Action: Continuing to drive with excessive oil consumption can lead to carbon buildup, catalytic converter damage, and premature engine wear. Addressing it promptly is crucial for the longevity of your engine.
Menu

Help & account