Ethylene glycol is a toxic chemical that can be harmful if ingested, so it's important to use the correct mixture of antifreeze and water to avoid any potential problems.
The 1990 Chevy Beretta GT has an aluminum engine, so it's important to use an antifreeze that is compatible with aluminum. Ethylene glycol is compatible with aluminum, so it is the best choice for this vehicle.
In addition to using the correct type of antifreeze, it's also important to change the antifreeze regularly according to the vehicle manufacturer's recommendations. This will help to protect the engine from corrosion and other damage that can be caused by old or contaminated antifreeze.