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I do not disagree with the previous post but I have heard of engine temp gauges that read slightly higher than normal when different types of coolant are mixed in a 50/50 manner such as when a water pump is changed and the coolant is drained out the lower radiator hose and not the block drain. Not all of the coolant is released from the block when the lower hose is removed. If you are changing the coolant any non-phosphate based anti freeze with a 50/50 mix is o.k. If you are just topping off the coolant resivoir (say less than a pint) you can use water.
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