Important Note: Never mix different types of coolant. Mixing Dex-Cool with other coolants can cause serious problems, including clogging and damage to the cooling system. If you're unsure what's currently in the system, it's best to completely flush and refill it with the correct Dex-Cool type. Check your owner's manual for the precise recommendations, as using the wrong coolant can void your warranty (if applicable) and damage your engine.