So you are saying that being able to put in 8 quarts of coolant out of a 10.6 quarts capacity is quite normal?

Another question comes to my mind:

I only drained the system and refilled with new coolant this time. What if I flush the system with water next time before I refill? Put in 8 quarts coolant of 50/50 mixture will make the overall antifreeze less than 50%. Should I put more antifreeze if I flush the radiator?

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Harry (94 C280)