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The system will have to clean throughly. The glycol will lead to severe oxidation and deposit formation when the oil gets hot and it will. The water is also a bad player as well. You can either pull the whole thing apart and clean everything with a safe solvent, parts washer solution, or a non-water cleaning fluid. I have heard of some folks flushing the system completely with a mineral oil around the same viscosity.
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Michael D. Holloway
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