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2017 Jetta GLI Excessive Oil Consumption

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Mike T. · rep 0 · May 22, 4:32 AM · 1 replies · solved · Question

Vehicle: 2017 Volkswagen Jetta GLI

Hello everyone,

I own a 2017 Volkswagen Jetta GLI with the 2.0T engine, and I've been noticing what seems like excessive oil consumption lately. I'm having to add a quart of oil every 1,500-2,000 miles, which feels much too frequent for a car with only 70,000 miles on it. I haven't seen any visible leaks under the car, nor do I see any blue smoke coming from the exhaust, which makes me wonder where the oil is going.

I've been diligent with my oil changes using the recommended synthetic oil. The car otherwise runs fine, no misfires or performance issues that I can detect. I'm just tired of constantly checking and topping off the oil. Is this a common issue with these 2.0T engines in the Jetta GLI, or should I be looking for something specific?

Any insights or similar experiences would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:32 AM

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ClearTheCode admin answer:

Excessive oil consumption without visible leaks or smoke is a concern that many owners of certain Volkswagen 2.0T engines have reported. While some oil consumption is normal, adding a quart every 1,500-2,000 miles is generally considered high.

  1. Common Causes:

    • PCV Valve Failure: A faulty Positive Crankcase Ventilation (PCV) valve is a very common cause of increased oil consumption in these engines. A failing PCV can allow excessive oil vapor to be drawn into the intake manifold and burned, or it can create incorrect crankcase pressure, leading to oil being pushed past seals.
    • Piston Rings: Worn or stuck piston rings can allow oil to bypass the pistons and burn in the combustion chamber. This is a more serious and costly repair.
    • Valve Stem Seals: Deteriorated valve stem seals can allow oil to seep into the combustion chambers, especially when the engine is cold or after prolonged idling.
    • Turbocharger Seals: Although you don't see blue smoke, failing seals within the turbocharger can allow oil to enter the exhaust or intake system and be burned off.

  2. When to See a Shop:

    • Soon: It's recommended to have your Jetta GLI inspected by a Volkswagen specialist. While not an immediate breakdown risk, consistently low oil levels can lead to premature engine wear and potential catastrophic failure if not monitored.
    • Diagnostics: A technician can perform a comprehensive diagnostic, including:
      • PCV System Check: This is often the first and easiest component to check and replace if faulty.
      • Compression and Leak-Down Test: These tests can help determine the condition of your piston rings and valve seals.
      • Oil Consumption Test: Some dealerships will perform a controlled oil consumption test, sealing the oil fill cap and dipstick, and having you return after a certain mileage to measure consumption accurately.
    • No Specific OBD Codes: Excessive oil consumption typically doesn't trigger specific OBD-II codes unless it leads to other issues like misfires (P030x) due to fouled spark plugs or catalytic converter inefficiency (P0420) over time.
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