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Is my 2018 Crosstrek burning too much oil?

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Brian F. · rep 0 · May 22, 3:14 AM · 1 replies · solved · Question

Vehicle: 2018 Subaru Crosstrek 2.0i Premium

Hi everyone,

I own a 2018 Subaru Crosstrek 2.0i Premium with about 70,000 miles. I've noticed recently that I'm having to add a quart of oil every 3,000-4,000 miles. There are no visible leaks under the car, and I don't see any blue smoke from the exhaust.

My oil changes are done regularly, usually every 6,000 miles with synthetic oil. Is this level of oil consumption normal for these engines, or should I be concerned? I've heard some Subarus can be a bit thirsty for oil, but this seems a bit excessive.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:14 AM

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ClearTheCode admin answer:

Excessive oil consumption is a known concern for some Subaru FB series engines, including those found in the 2018 Crosstrek. While a small amount of oil consumption is normal for any engine, adding a quart every 3,000-4,000 miles can be considered on the higher side, especially if it's increasing.

Here are the common causes and steps to take:

  1. Piston Ring Design: Some earlier FB engines had piston rings that could allow oil to bypass and be burned in the combustion chamber. While improvements were made, some vehicles may still exhibit this tendency.
  2. PCV Valve Issues: A clogged or faulty Positive Crankcase Ventilation (PCV) valve can lead to increased crankcase pressure, forcing oil past seals or piston rings.
  3. Valve Guide Seals: Worn valve guide seals can allow oil to seep into the combustion chamber, especially when the engine is cold or during deceleration.
  4. Turbocharger Seals (if applicable): While your 2.0i is naturally aspirated, for turbocharged models (like the Forester XT or WRX), failing turbo seals can also cause oil consumption.

When to see a shop:

  • Oil Consumption Test: The first step is to have a Subaru dealership or trusted independent mechanic perform an official oil consumption test. This involves topping off the oil, sealing the dipstick/fill cap, and having you return after a set mileage (e.g., 1,200 miles) to measure the consumption accurately.
  • Diagnostics: If the test confirms excessive consumption, the shop will investigate further. This might include checking the PCV system, performing a compression or leak-down test, or inspecting for internal issues.
  • Warranty: While your 2018 Crosstrek is likely out of the original powertrain warranty, it's worth checking if there were any extended warranties or service campaigns related to oil consumption for your specific VIN. Subaru has addressed these issues for certain model years.

Monitoring your oil level regularly and documenting your consumption is crucial. If left unaddressed, severe oil consumption can lead to engine damage due to insufficient lubrication.

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