Is it necessary to go the dealer replenish coolant on a 2000 Subaru outback or can you simply use from any auto parts store?

You don't need to go to the dealer to replenish coolant for your 2000 Subaru Outback. However, it's crucial to use the correct type of coolant. Subaru specifies a certain type, often a 50/50 pre-mix of coolant and distilled water, and it's important to match that specification.

Simply going to an auto parts store and grabbing *any* coolant is risky. Using the wrong type can damage your engine. Check your owner's manual (or Subaru's website) for the specific coolant type recommended for your 2000 Outback. The manual will specify the color and type (e.g., a specific type of antifreeze/coolant, often with a Subaru-specific designation). The auto parts store staff should be able to help you find the correct coolant once you know the specification.

In short: No need for the dealer for *replenishment*, but yes, you *must* use the correct coolant type.