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2016 LaCrosse Excessive Oil Consumption

0

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

Vehicle: 2016 Buick LaCrosse Premium

Hi everyone,

I'm posting about a worrying issue with my 2016 Buick LaCrosse, a Premium model with the 3.6L V6 engine. It's got about 90,000 miles on it, and I've noticed it's been consuming an excessive amount of oil lately. I'm having to add a quart or more between oil changes, which seems really high.

There are no visible leaks on my driveway, and I don't see any blue smoke from the exhaust, which makes me think it's not an obvious external leak or severe burning. I've heard some GM 3.6L engines can have oil consumption issues. Is this a common problem for the 2016 LaCrosse?

What could be causing this, and what should I do? I'm worried about potential engine damage if this continues. Any advice from other owners or mechanics would be great!

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

Excessive oil consumption in the 3.6L V6 engine, like the one in your 2016 Buick LaCrosse, has been a known concern for some GM vehicles. While a small amount of oil consumption is normal, needing to add a quart or more between changes indicates a problem that needs attention.

Common Causes for Excessive Oil Consumption (3.6L V6):

  • PCV System Issues: A clogged or malfunctioning Positive Crankcase Ventilation (PCV) system can cause excessive vacuum in the crankcase, drawing oil into the intake manifold to be burned.
  • Piston Ring Wear/Design: Some engines, including earlier versions of the 3.6L, had piston ring designs that were prone to sticking or not seating properly, leading to oil bypassing into the combustion chamber.
  • Valve Guide Seals: Worn or hardened valve guide seals can allow oil to seep down past the valve stems into the combustion chamber.
  • Timing Chain Issues (less direct but related): While not a direct cause of consumption, problems with timing chains (which were an issue on some earlier 3.6L engines) can lead to engine wear that exacerbates oil use.
  • Oil Cooler/Filter Adapter Leaks (external): While you mentioned no visible leaks, sometimes leaks can be subtle or burn off before reaching the ground.

When to See a Shop & What to Expect:

  1. Oil Consumption Test: A reputable shop or dealership will typically perform an official oil consumption test. This involves draining and refilling the oil, sealing the drain plug, and having you return after a specified mileage (e.g., 1,000-2,000 miles) to measure the actual oil loss.
  2. Scan for Diagnostic Trouble Codes (DTCs): While there isn't a direct OBD code for oil consumption, excessive burning can lead to codes like P0300 (Random/Multiple Cylinder Misfire Detected) or P0420/P0430 (Catalyst System Efficiency Below Threshold) due to fouled spark plugs or catalytic converter damage.
  3. PCV System Inspection: The PCV valve and associated hoses will be inspected for clogs or failures.
  4. Compression and Leak-Down Test: These tests can help determine the health of the piston rings and valve seals.
  5. Borescope Inspection: A technician might use a borescope to look into the cylinders for signs of oil burning or piston ring issues.

Addressing excessive oil consumption is crucial to prevent long-term engine damage. If piston rings or valve seals are the cause, it can be a significant repair.

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