Subaru Forester engine knocking and consuming one quart of oil monthly on Subaru Forester

Some Subaru Forester owners report experiencing engine knocking, which may be indicative of issues such as low-quality fuel, incorrect octane rating, or potentially serious internal problems. They emphasize the importance of addressing this knocking promptly to prevent further engine damage and maintain optimal performance. Additionally, some owners have noted excessive oil consumption, requiring them to add a quart of oil every month, which exceeds Subaru's normal threshold of less than 1 quart per 1,200 miles. This excessive consumption may warrant an oil consumption test at a dealership to determine if the vehicle qualifies for an engine block replacement. Owners are advised to monitor their mileage and oil usage closely and consult a qualified mechanic or Subaru dealership for a thorough inspection and necessary repairs if they suspect engine knocking or excessive oil consumption.