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Excessive Oil Consumption on my 2017 340i - Normal or Problem?

0

Chris P. · rep 0 · May 22, 4:02 AM · 1 replies · solved · Question

Vehicle: 2017 BMW 340i xDrive

Hey everyone,

I've got a 2017 BMW 340i xDrive, and I've noticed it's been consuming a fair bit of oil lately. I'm adding about a quart every 1500-2000 miles. There are no visible leaks on my garage floor, and I haven't seen any major smoke from the exhaust, though maybe a puff on a cold start sometimes.

Is this normal for the B58 engine, or should I be concerned? I've heard about PCV valve issues on other BMW engines, could that be a culprit here? Just trying to figure out if this is something I need to address or if it's within expected parameters for these cars. Any advice would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:02 AM

0

ClearTheCode admin answer:

Excessive oil consumption can be a concern, even on modern engines. While some consumption is normal, a quart every 1500-2000 miles warrants investigation, especially if it's a recent development.

  1. Monitor and Document: Keep a detailed log of oil added, mileage, and driving conditions. This data will be crucial for diagnosis.
  2. Inspect for External Leaks: Even if you don't see drips, check common leak points like the valve cover gasket, oil filter housing gasket, and oil pan gasket. Use a flashlight to look for residue or staining.
  3. PCV System (Crankcase Ventilation): The PCV valve (integrated into the valve cover on the B58) is a common cause of increased oil consumption and can lead to vacuum leaks. A failing PCV can draw oil into the intake manifold. Symptoms might include a whistling noise from the engine, rough idle, or lean condition codes.
  4. Turbocharger Seals: Worn turbocharger seals can allow oil to enter the exhaust or intake system. Look for blue smoke under acceleration or deceleration.
  5. Internal Engine Wear: Less common on newer B58 engines, but piston rings or valve stem seals can also contribute to oil consumption.

Common OBD Codes (if PCV related):

  • P0171: System Too Lean (Bank 1)
  • P0174: System Too Lean (Bank 2)

When to See a Shop: If you've ruled out obvious external leaks and suspect a PCV issue, turbo seals, or internal wear, it's best to take your 2017 BMW 340i to a qualified BMW specialist. They can perform a smoke test to identify vacuum leaks, check crankcase pressure, and conduct a more thorough diagnostic to pinpoint the exact cause of the oil consumption. Addressing this promptly can prevent further engine issues.

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