Subaru recommends a coolant drain and refill at 100,000 miles or 5 years, whichever comes first. The formulation is designed to be compatible with the aluminum alloys found in the radiator and engine blocks of models like the Forester, Outback, and Legacy.
Subaru Boxer Engine Coolant Needs and Proper Maintenance
This specific color is not merely aesthetic; it is a visual indicator to prevent mixing with other coolant types. Using the correct formulation is critical for preventing corrosion, ensuring the freeze point is appropriate for harsh climates, and protecting the water pump and radiator.
For the absolute safety of your investment, look for products specifically labeled for Subaru, Mitsubishi, or certain late-model Toyotas, as these manufacturers share similar coolant specifications. Modern Subaru vehicles, whether they feature the horizontally-opposed Boxer engine or the standard all-wheel-drive system, rely on a precise cooling system to maintain optimal performance.
Subaru Boxer Engine Coolant Needs and Proper Maintenance
However, if you notice the coolant level dropping frequently, it could indicate a leak or internal issue. When performing a flush, it is not enough to simply drain the radiator.
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