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If it is motor oil in the anti freeze, then it is either a cracked head, cracked engine block, or a head gasket blown. If it is Transmission Fluid in your antifreeze, then the radiator is leaking from the transmission cooler ----- although usually that would cause antifreeze to be in your transmission fluid.

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Q: What would cause oil to leak into the antifreeze reservoir on a Chevy Venture?
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