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Excessive Oil Consumption on 2016 Outback 2.5i - Is this normal?

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Mike T. · rep 0 · May 25, 2:19 AM · 1 replies · solved · Question

Vehicle: 2016 Subaru Outback 2.5i Limited

Hi all,

I own a 2016 Subaru Outback 2.5i Limited with about 95,000 miles. For the past year or so, I've noticed that I'm adding oil more frequently than I should be between oil changes. I'm talking about a quart or more every 3,000 miles, sometimes even less. There are no visible leaks under the car, and I don't see any blue smoke from the exhaust.

I know some engines burn a little oil, but this seems excessive. Is this a common issue with the 2.5L FB engine in these Outbacks? Should I be concerned, or is this just something I need to live with? What steps can I take to figure out if it's a problem?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:19 AM

0

ClearTheCode admin answer:

Excessive oil consumption has been a topic of discussion for certain Subaru engines, including some FB series engines found in your 2016 Outback. While some oil consumption is normal for any internal combustion engine, what you're describing might be beyond the typical range.

Here's a breakdown of what to consider and what steps to take:

  1. Understanding Normal vs. Excessive:

    • Subaru generally considers consumption of up to one quart per 1,200 miles as 'normal' for some engines, though many owners find this high. Your consumption rate of a quart every 3,000 miles, while not as severe as some reported cases, warrants investigation.
    • The absence of visible leaks or smoke suggests the oil is being consumed internally, likely past piston rings or valve guides.

  2. Potential Causes for FB Engines:

    • Piston Ring Design: Earlier FB series engines (roughly 2011-2015, but sometimes extending) had piston ring designs that could contribute to higher oil consumption. While your 2016 is a bit newer, it's still worth considering.
    • PCV System: A clogged or malfunctioning Positive Crankcase Ventilation (PCV) system can also contribute to oil consumption.

  3. Recommended Actions:

    • Perform an Oil Consumption Test: This is the most crucial step. A Subaru dealership or trusted independent mechanic can perform a standardized oil consumption test. This involves topping off the oil, sealing the dipstick/fill cap, driving for a specified mileage (usually 1,000-1,200 miles), and then measuring the exact amount of oil consumed.
    • Check for TSBs/Recalls: In the past, Subaru issued extended warranties and TSBs for certain models regarding excessive oil consumption, which sometimes involved short block replacement. While your 2016 might be outside the primary range for these, it's worth checking if any apply.
    • Monitor Oil Levels Regularly: Until the issue is resolved, checking your oil level every 1,000-1,500 miles is critical to prevent engine damage from low oil.

  4. When to See a Shop:

    • Schedule an oil consumption test with a reputable Subaru specialist. They can accurately diagnose the cause and recommend the appropriate repair, which could range from PCV valve replacement to more extensive engine work if the piston rings are confirmed as the culprit. Low oil levels can eventually trigger engine codes like P0011 (Intake Camshaft Position Timing Over-Advanced) or P0016 (Crankshaft Position - Camshaft Position Correlation) due to VVT system issues if oil pressure drops too low.
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