Upgrading to a full synthetic product provides better thermal stability, reducing the formation of sludge in the narrow oil galleries that characterize Subaru’s boxer engine design. Avoid cheap, no-name brands from discount shelves, as they often fail to meet the shear stability requirements needed for the continuously variable transmission.
2020 Subaru Outback Oil Expert Review: Best Oil Choices and CVT Protection
Subaru typically recommends a 5W-20 viscosity for daily driving efficiency and cold-start protection. High-quality detergents prevent varnish buildup on the valves and pistons, which can lead to misfires or reduced fuel economy.
Subaru specifies particular performance standards that protect the horizontally-opposed engine under heavy loads and varying temperatures. The condition of the valve cover gaskets is a common issue on older Outbacks, and the right additive package can extend their life.
2020 Subaru Outback Oil Expert Review: Best Type and Viscosity
However, owners who frequently tow trailers or drive in extreme climates might find a 5W-30 more suitable to maintain oil pressure under stress. This is vital for the continuously variable transmission (CVT), which relies on the same oil supply for cooling and hydraulic pressure.
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