The molecular structure of synthetic motor lube is very different. Organic oil molicules are "round", while synthetic oil molicules are "flat".
"Flat" molicules, as a result of being flat seem to move with less friction & heat. These "flat" molicules also seem to be able to absorb much more heat and dirt without the resulting heat and loss in lubricity.
This is the simplest explaniation I can think of without getn too wordy......
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