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Want it SUPER rust free? Buy 2 gallons of Evaporust (Harbor Freight). Get your engine warm, dump your coolant, refill with Evaporust, run until it warms up and you are 100% certain the thermostat is open. After the Evaporust has made the rounds shut off the engine and let it sit overnight. Next day, fire it up until it's warm again and TS is open. Drain the Evaporust (save it, it's reusable) and refill with your choice or coolant. Your radiator, block, and any other metal it contacts and soaks will be free of rust, stuff works amazingly well and absolutely will not harm your engine or radiator, etc.

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