Difference between di-ester and polyol-ester

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What's the difference. I'm assuming that there is one since diester oils(Amsoil Compressor oil) are comparable in price to PAOs. I've never seen the price of a polyol-ester based oil, but I understand that it is much more expensive.
 
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organic compound that contains two ester groups Di- meaning 2 in greek terms. Polyol containing usually severalalcoholic hydroxyl groups Basically is sounds like the chemicals you would find in any of your synthetic lube. for high thermal stability
 
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