I have been doing engine repair for over 35 years, and have stuck my finger in a few places (including antifreeze) and know how slippery it is.

I am aware of antifreeze having lubricating properties, but I don't think it's got anything to do with engine oil. Possibly some type of silicone or similar chemical.

If I can't blame the swelling hose on the oil in the cooling system, what should I blame it on?

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Power Generation Specialist.

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We judge others by their actions.