Generally, Dodge Ram vans of that era used either:
* Dex-Cool (or a compatible OAT – Organic Acid Technology antifreeze): This is a longer-lasting antifreeze, but it's not compatible with traditional green antifreeze. Mixing them can cause serious engine damage.
* Traditional Green antifreeze (IAT – Inorganic Acid Technology): This is less expensive and readily available, but requires more frequent changes.
Do not assume. Mixing the wrong antifreeze can lead to costly repairs or complete engine failure. Consult your owner's manual or a trusted mechanic to ensure you use the correct antifreeze for your specific 2000 Dodge Ram Van's engine.