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Excessive Oil Consumption - 2019 Audi A5 Cabriolet 2.0T

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Mike T. · rep 0 · May 26, 3:44 AM · 1 replies · solved · Question

Vehicle: 2019 Audi A5 Cabriolet 2.0T

Hello everyone,

I own a 2019 Audi A5 Cabriolet with the 2.0T engine (B9 generation), and I've noticed what seems like excessive oil consumption. I'm adding about a quart of oil every 1,500-2,000 miles. I check the MMI oil level regularly, and it consistently drops.

The car has about 45,000 miles on it and doesn't show any visible leaks under the car or smoke from the exhaust. There are no warning lights on the dash either. I'm using the recommended 5W-40 synthetic oil.

Is this normal for these 2.0T engines, or should I be concerned? What could be causing this much oil to disappear without any obvious signs? Any advice on what to look into would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:44 AM

0

ClearTheCode admin answer:

Excessive oil consumption in Audi's 2.0T engines (EA888 Gen 3, which is likely in your 2019 A5) can be a concern, although a certain degree of consumption is considered normal by manufacturers. However, a quart every 1,500-2,000 miles is on the higher end of what's typically acceptable.

Common Causes of Oil Consumption:

  • PCV Valve Failure: A faulty Positive Crankcase Ventilation (PCV) valve system is a very common cause of oil consumption in these engines. A failing PCV can lead to excessive crankcase vacuum, pulling oil into the intake manifold.
  • Turbocharger Seals: Worn or damaged turbocharger seals can allow oil to leak into the exhaust or intake side of the turbo, where it's burned off without visible smoke (especially if it's a slow leak).
  • Piston Rings/Cylinder Wear: Less common in newer engines but still possible, especially if maintenance has been neglected. Worn piston rings can allow oil to bypass into the combustion chamber.
  • Valve Stem Seals: Worn valve stem seals can allow oil to seep past the valves and into the combustion chamber.
  • Minor External Leaks: Even if you don't see puddles, small leaks from the timing cover, valve cover, or oil filter housing can evaporate before hitting the ground, contributing to consumption.

Troubleshooting Steps:

  1. Perform an Oil Consumption Test: The most reliable way to diagnose this is to have an authorized Audi dealer perform a controlled oil consumption test. They will fill the oil, seal the dipstick/fill cap, and have you return after a set mileage (e.g., 1,000 miles) to measure the exact consumption.
  2. Inspect PCV System: A visual inspection of the PCV valve and associated hoses for cracks or blockages can be done. Sometimes, a failed PCV can also lead to whistling noises from the engine.
  3. Check for DTCs: Although you have no warning lights, a deeper scan might reveal codes related to engine performance or emissions that could indirectly point to oil consumption issues (e.g., P052E - PCV Regulator Valve Performance).

When to See a Shop:

Given the consumption rate, it's highly advisable to visit an Audi dealership or a reputable independent Audi specialist. They can:

  • Conduct the official oil consumption test.
  • Perform a smoke test to identify any vacuum leaks or external oil leaks.
  • Inspect the PCV system thoroughly.
  • Check turbocharger health and look for signs of oil in the intake or exhaust.
  • Based on the findings, they can recommend specific repairs, which could range from a PCV valve replacement to more involved engine work if piston rings or valve seals are implicated.
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