Well, I'm pretty sure if its staying filled, thats good (unless you have some sort of head leak or something I dont know)
You may want to opt for a radiator flush. They are kinda pricey (59.99 to 79.99) but well worth it. If you have the incorrect balance of water to antifreeze, your boiling point will be too low(or too high depending on the situation) and cause problems, especially in the winter.
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