If it has never had any water/coolant added, then no it doesn't require antifreeze.
it could mean you need a new carburetor
Antifreeze does 2 things. First it protects your engine when the outside temperature is below freezing and the vehicle is not running. If the coolant freezes it could crack your engine block requiring a new engine. Caution: 100% antifreeze will also freeze up if it gets too cold. For best results you have to mix antifreeze and water. Check the antifreeze container for correct mixture. Antifreeze also has other things in it that keeps the water pump in good shape, prevents corrosion of the the radiator and helps transfer heat out of the engine. You need it even in hot weather.
If you find traces of oil in the antifreeze it's an indication of broken engine gasket. You need to go consult with a professional.
No the engine is not ruined. It needs a new head gasket and an oil change after the gasket been changed.
heater core is shot and you have to get a new one
You need a 50/50 mixture of water and antifreeze.
No worries, a few dollars from the wallet, perhaps, but not the thousands a new engine could cost. Do not drive the vehicle with that much antifreeze in the oil. Drain the oil, replace the oil and filter. Now drive around for a while (a day or two normal driving, assuming it's enough to get the engine up to normal operating temperatures). Replace the oil and filter again. This should be sufficient to cleanse the antifreeze from the system, but watch for white or antifreeze colored foam on the oil dipstick indicating the continued presence of water or antifreeze in the oil, in which case, replace the oil and filter again.
Make SURE the engine is COLD. Then unscrew the old sensor and install the new one. Antifreeze will leak out of the engine so be quit when replacing it.
An automotive product called "Bar's Leaks" will effectively seal any "small" coolant leak in the radiator but if the leak is coming from the engine area; this may require new freeze plugs and/or block sealer if the leak is not too serious.
If the engine coolant is rusty color you would need to have the engine cooling system flushed and then a new 50 / 50 mixture of preferably distilled water and antifreeze used to refill the system
First DON'T START THE ENGINE If you start the engine the antifreeze will be in the oil filter also Drain the oil out of the oil pan Take some new oil and pour it into the engine a few times and just let it drain out of the engine oil pan Replace the engine oil pan drain plug and then put the proper type of engine oil in ( less the amount the engine oil filter holds ) If you haven't started the engine you should be okay
I am trying to drain old antifreeze and replace with new and cannot figure out how to remove the radiator plug on my 2001 Chevy impala 3400V6 engine?