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Excessive Oil Consumption in my 2019 SQ5 Prestige - Is PCV Valve the Culprit?

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Mike T. · rep 0 · May 26, 3:49 AM · 1 replies · solved · Question

Vehicle: 2019 Audi SQ5 Prestige

Hey fellow SQ5 owners,

I've noticed my 2019 Audi SQ5 Prestige has been consuming an unusual amount of oil lately. I seem to be adding a quart every 1,500-2,000 miles, which feels excessive for a relatively new car. There are no visible leaks under the car, and I haven't seen any blue smoke from the exhaust, so I'm a bit puzzled.

I've read online that excessive oil consumption in these engines can sometimes be linked to a faulty PCV (Positive Crankcase Ventilation) valve. Could this be the case for my SQ5? I'm trying to gather some information before I take it to the dealership.

Has anyone with a 2019 or similar model year SQ5 experienced high oil consumption, and if so, what was the cause? Any diagnostic tips or things I should mention to the service advisor would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:49 AM

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ClearTheCode admin answer:

Excessive oil consumption in a 2019 Audi SQ5 Prestige, especially without visible leaks or smoke, can indeed be a cause for concern and a common topic of discussion among Audi owners. The PCV valve is a very plausible culprit.

1. Initial Diagnostics & Checks:

  1. Monitor Oil Level Religiously: Keep a detailed log of when you add oil, how much, and the mileage. This data is crucial for diagnosis.
  2. Check for Engine Codes: While not always present for oil consumption alone, a failing PCV valve can sometimes trigger codes like P0171/P0174 (System Too Lean) or P050A (Cold Start Idle Air Control System Performance) if it causes a vacuum leak.
  3. PCV Valve Test (Simple): With the engine running at idle, try to remove the oil filler cap. If there's significant suction holding the cap down, or a strong whooshing sound when you remove it, it could indicate a faulty PCV valve not regulating crankcase pressure properly.

2. Common Causes of Oil Consumption:

  • Faulty PCV (Positive Crankcase Ventilation) Valve: This is a leading suspect. A failing PCV valve or its associated breather system can allow excessive oil vapor to be drawn into the intake manifold and burned, leading to consumption without external leaks.
  • Worn Piston Rings/Cylinder Walls: While less common in a 2019 model, wear can lead to oil bypassing the piston rings and burning in the combustion chamber.
  • Turbocharger Issues: A failing turbocharger seal can allow oil to leak into the exhaust or intake side, leading to consumption.
  • Valve Stem Seals: Worn valve stem seals can allow oil to seep into the combustion chamber, especially during engine braking or cold starts.
  • Software Glitch: In some cases, engine management software can contribute to minor oil consumption, though this is usually less significant than your reported rate.

3. When to See a Shop:

It's important to address excessive oil consumption to prevent potential long-term engine damage (e.g., carbon buildup, catalytic converter issues). You should schedule an appointment with an Audi specialist or dealership.

  • As soon as possible to have a professional diagnosis. Be sure to provide your detailed oil consumption log.
  • An Audi technician will typically perform a more thorough PCV system test, check for vacuum leaks, and potentially conduct an oil consumption test over a set mileage. They can also inspect the turbocharger and perform compression/leak-down tests if other causes are suspected. Early diagnosis can prevent more severe engine problems down the line.
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