Open your radiator cap and see what color the coolant is and replace it with the same color coolant, it doesn't matter what brand it is.
The Best coolant for your 350Z is the original coolant from Nissan or a coolant with the same color the you have in now in your vehicle. Some cars need a special type of fluid which you can check in your owners manual.
Radiator
Answering "Where is engine coolant drain plug for a 1.8 Nissan sentra engine?"
What type of coolant should i use in 2006 Nissan Quest
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Any SAE certified coolant is recommended for the 2002 Nissan Frontier. The coolant should have a minimum temperature range of -25 degrees Fahrenheit and 120 degrees Fahrenheit.
The coolant drain plug on a Nissan Micra engine block is on the upper part of the block. It is under the intake manifold.
The coolant temperature sensor, on your 2002 Nissan, is located on the front of the engine. The sensor is just above the water pump.
boobs
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The coolant temperature sensor, on your 1999 Nissan, is located a few inches above the water pump. The sensor will have two wires going to it.