If you’ve noticed that your Subaru’s oil level is dropping faster than expected or spotted some blue smoke from the tailpipe, you’re likely wondering, “Why is my Subaru burning oil?” As your trusted local mechanic here in Boulder, Colorado, we’re here to break it down.
Common Reasons Subarus Burn Oil
Subaru engines are known for their durability, but like any car, they can develop quirks over time. Here are a few common causes of oil burning in Subarus:
1. Worn Piston Rings or Cylinder Walls
Piston rings seal the combustion chamber in your engine. If they wear out, oil can seep into the combustion chamber and burn alongside fuel. This is a frequent issue in higher-mileage vehicles.
2. Valve Seal Issues
Valve seals keep oil from entering the engine's combustion chamber. If they deteriorate, oil may find its way into the chamber, resulting in oil loss and exhaust smoke.
3. PCV (Positive Crankcase Ventilation) System Problems
The PCV system removes excess pressure from the engine. If it’s clogged or failing, it can push oil into places where it doesn’t belong, leading to burning.
4. Subaru-Specific Engine Design
Subaru’s boxer engine design is efficient but prone to oil consumption, particularly in models like the Subaru Outback, Forester, and Impreza from certain years. In some cases, oil-burning issues may stem from factory defects or wear unique to this engine type.
5. Driving Habits and Conditions
Hard acceleration, towing, or mountain driving (hello, Colorado Rockies!) can cause engines to burn oil faster.
What Can You Do?
If you suspect your Subaru is burning oil, don’t ignore it. Driving with low oil can lead to severe engine damage. Here are the steps to take:
1. Check Your Oil Regularly
Top off the oil as needed and monitor how quickly the level drops.
2. Schedule a Diagnostic Check
At John’s Auto Care, we can inspect your engine for leaks, worn components, or faulty seals. Our Subaru experts will pinpoint the problem.
3. Consider Repairs or Maintenance
Depending on the issue, repairs may range from replacing a PCV valve to addressing piston ring wear. Regular oil changes with the right oil for your Subaru can also help.
Don’t Let Oil Burning Burn a Hole in Your Pocket
Oil burning is a common problem for many Subaru owners, but it’s not one you have to live with. If you’re in Boulder or the surrounding areas, let the Subaru specialists at John’s Auto Care take a look. We’ll get to the root of the problem and keep your vehicle running smoothly, whether you're commuting through town or heading up I-70 for some skiing at Eldora.
Have more car questions? Ask John! We’re always here to help. Call us today or book your appointment online!