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It came with "Dex Cool" in it originally. (Red colored fluid). This antifreeze is responsible for softening the seals and causing intake gasket leaks on small block GM vehicles. Flush the dex-cool out as best you can and refill it with antifreeze that is designed to be mixed with either type of coolant. Mixing regular antifreeze with Dexcool unless it states on the container that it is intended to be mixed with it will cause the Dexcool to turn to jello and will plug up your system. Dexcool should be removed and flushed out COMPLETELY before adding any other type of antifreeze.

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14y ago
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Q: What type of antifreeze is needed for 98 Chevy 1500 van?
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