The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2016 Forester 2.5i Using Too Much Oil

0

Mike T. · rep 0 · May 25, 2:14 AM · 1 replies · solved · Question

Vehicle: 2016 Subaru Forester 2.5i Premium

Hi everyone, I own a 2016 Subaru Forester 2.5i Premium with about 70,000 miles. For the past few months, I've noticed that I'm constantly having to add oil between oil changes. I get my oil changed every 5,000 miles, and by about 3,000-4,000 miles, the dipstick is showing low. I'm adding about 1 to 1.5 quarts every 5,000 miles.

There are no visible leaks on my driveway, and I don't see any smoke coming from the exhaust. The car runs fine, no weird noises or loss of power. Is this normal for these engines, or should I be concerned? I've heard some Subarus have oil consumption issues, but I'm not sure if this amount is excessive.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:14 AM

0

ClearTheCode admin answer:

Excessive oil consumption in certain Subaru FB-series engines, including the 2.5L in your 2016 Forester, has been a documented concern. While some oil consumption is normal for any engine, adding 1 to 1.5 quarts over 5,000 miles can be considered on the higher side, especially if there are no external leaks.

Possible Causes:

  1. Piston Ring Design: Some earlier FB engines had piston rings that were prone to sticking or not sealing as effectively, leading to oil bypassing into the combustion chamber and burning off.
  2. PCV (Positive Crankcase Ventilation) System Issues: A clogged or malfunctioning PCV valve can cause excessive crankcase pressure, forcing oil past seals or piston rings.
  3. Valve Guide Seals: Worn or hardened valve guide seals can allow oil to seep into the combustion chamber, particularly when the engine is decelerating or idling.
  4. Turbocharger (if applicable): While your 2.5i is naturally aspirated, for others with turbo models, a failing turbocharger seal can also cause oil consumption (though usually accompanied by blue smoke).

When to See a Shop:

  • Soon: It's advisable to have a Subaru dealership or an independent shop experienced with Subarus perform an oil consumption test. This typically involves changing the oil, sealing the drain plug, and having you return after a specified mileage (e.g., 1,200 miles) to measure the exact consumption.
  • Immediately: If you notice blue smoke from the exhaust, a strong burning oil smell, or if the oil consumption suddenly increases dramatically.

What a Shop Will Do:

  1. Oil Consumption Test: This is the standard procedure to officially diagnose excessive oil consumption.
  2. PCV System Inspection: Check the PCV valve and hoses for clogs or proper function.
  3. Compression/Leak-Down Test: These tests can help determine the health of the piston rings and valves.
  4. Recommendations: Based on the test results, solutions could range from replacing the PCV valve, more frequent oil changes, or in more severe cases, engine work like piston ring replacement.
Menu

Help & account