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Excessive Oil Consumption - 2019 Audi A4 S Line

0

Mike T. · rep 0 · May 26, 3:41 AM · 1 replies · solved · Question

Vehicle: 2019 Audi A4 S Line

Hello everyone,

I'm reaching out because I've noticed my 2019 Audi A4 S Line (2.0T engine) seems to be consuming oil at an alarming rate. I bought it used about a year ago, and in the last 5,000 miles, I've had to add nearly 2-3 quarts of oil between regular oil changes. There are no visible leaks that I can find on my garage floor or around the engine bay.

I'm using the recommended synthetic oil, and I keep an eye on the MMI oil level indicator. It just seems to drop much faster than I'd expect for a car with only 45,000 miles on it. I'm concerned this might be a sign of a bigger problem.

Has anyone else with a B9 A4 experienced this level of oil consumption? What did you find was the cause, and how was it addressed?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:41 AM

0

ClearTheCode admin answer:

Excessive oil consumption in Audi's 2.0T engines (EA888 Gen 3, which is in your 2019 A4) can be a concern, though a certain amount of consumption is considered normal by manufacturers. However, 2-3 quarts over 5,000 miles warrants investigation. Here's what to look into:

1. Common Causes:

  • PCV (Positive Crankcase Ventilation) Valve: A faulty PCV valve is a very common cause of increased oil consumption. If it's stuck open, it can draw excessive oil vapor into the intake manifold, where it's burned off.
  • Turbocharger Seals: Worn or failing turbocharger seals can allow oil to leak into either the exhaust or intake side of the turbo, leading to consumption without external leaks.
  • Piston Rings: While less common on the Gen 3 EA888 compared to earlier generations, worn or stuck piston rings can still contribute to oil burning.
  • Valve Stem Seals: These seals prevent oil from leaking down the valve guides into the combustion chamber. If they harden or fail, oil consumption can increase.

2. Diagnostic Steps & Solutions:

  1. Perform an Oil Consumption Test: An Audi dealership or independent specialist can perform a formal oil consumption test. This involves topping off the oil, sealing the fill cap, driving for a set mileage, and then measuring the exact amount of oil consumed.
  2. Inspect the PCV Valve: A failing PCV valve can sometimes be identified by an audible whistle or excessive vacuum when removing the oil cap with the engine running. It's a relatively inexpensive part to replace.
  3. Check for Leaks (Internal/External): Even if you don't see drips, oil could be leaking and burning off on hot engine components. A professional can use UV dye or a smoke test to detect subtle leaks.
  4. Monitor Exhaust Smoke: While driving, have someone observe if there's any blue smoke from the exhaust, especially on startup or during hard acceleration/deceleration, which indicates oil burning.

3. When to See a Shop:

  • If your oil consumption exceeds 1 quart per 1,000 miles, it's generally considered excessive and requires professional attention.
  • If you notice any blue smoke from the exhaust.
  • If you find any oil residue in the turbocharger's intake or exhaust piping.
  • While specific OBD-II codes directly for oil consumption are rare, a persistent low oil level can trigger a P0520 (Engine Oil Pressure Sensor/Switch Circuit Malfunction) or other oil pressure-related codes. A professional diagnostic scan can also reveal other engine performance codes that might indirectly point to the issue.
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