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I suggest using the Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT that complies with FCA Material Standard MS. 90032 for your Chrysler 300. It's important to change the coolant for your engine every 100,000 miles or ten years. Over time, coolant loses its ability to prevent corrosion and provide proper lubrication for your engine. If left unchanged, the coolant can lead to radiator corrosion, causing rust that can damage your radiator and engine. Look out for signs such as coolant leaks, unusual engine noises, the smell of antifreeze, or frequent overheating, indicating the need for an immediate radiator flush.
The coolant variety utilized for the Chrysler 300 is Peak OET Antifreeze/Engine Coolant NAO0B3.
Here is a paraphrased and revised version: Prevents freezing, stays liquid below zero degrees Fahrenheit.