Organic Acid Technolgy (OAT) coolant's main anti-corrosion inhibitor is either sodium or Potassium 2-ethylhexanoate which form ethylhexanoic acid and that is what is incompatible with silicone Rubber. Ethylhexanoic acid will slowly eat away at the silicone of the hose.

Fluorosilicone hoses are compatible with OAT coolant, but 99% of all silicone hoses on the market are not made from this primarily because it is more than three times as expensive as standard silicone.

You would be ill-advised to use old fashioned Inorganic Acid Technology (IAT) coolant as its anti-corrosion properties rely on it building up a layer of silates on the internal surfaces of the cooling system. This layer of silicates is not good for the longevity of mechanical water pump seals on pumps designed to run with OAT coolants.

You basically have three options: (1) Find some hoses that are fluorosilicone (state that they are 'OAT Safe'). (2) Find an OAT based coolant that states it specifically excludes 2-EHA. There are some just coming on to the market but they are very expensive and hard to find. (3) Stick with the OE hoses and get another ten years of use without the added complexities.

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