Subaru recommends an oil change every 5,000 to 7,500 miles for normal driving conditions, or every 3,500 to 5,000 miles for severe duty. The Role of Oil in All-Wheel Drive Performance \ The correct oil type does more than just lubricate the engine; it plays a vital role in the functionality of the Subaru symmetrical all-wheel-drive system.
2014 Subaru Forester Oil Guide: Understanding the Right Type and Viscosity
Subaru mandates the use of a synthetic blend or full synthetic oil that carries the API SN (or later) certification. Using the correct 5W-30 viscosity ensures that the clutch packs and gears within the transfer case engage smoothly, providing the predictable handling that Subaru drivers expect in various road conditions.
For this model, the oil type must be CK-4 rated, typically with a 5W-40 viscosity, to ensure the longevity of the fuel injection system and after-treatment components. This certification guarantees the oil contains the necessary additives to combat the high temperatures generated by the horizontally-opposed engine and to keep the turbochargers (if equipped) clean and responsive.
2014 Subaru Forester Oil Guide: Choosing the Right Type and Viscosity
Manufacturer Specifications for 2014 Models Subaru provides specific guidelines that override any generic advice, and for the 2014 Forester, the requirements are clear and standardized. The diesel engine requires a specific formulation designed to handle the higher compression and particulate filter systems.
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