Precisely, the idea of a synthetic oil, rather than improving lubrication, is that its aggregates control the acids that are produced in combustion, and its detersive agents keep the particles in suspension, to prevent them from precipitating and forming "mud" in the oil pan. Therefore, synthetics have the possibility of being used for a longer time, "because their additives that control acids and mud", take "a little more time to degrade" ... TBN (which is the ability to control acids) ..... and the 7100 has very good alkaline reserve values (perhaps due to the fact that it is an ester) ... other synthetic oils, but with PAO technology ... they have less TBN, that is, they are synthetic but of lower quality . MINERAL <SEMI<SINTHETYC .... PAO < ESTER
with use, rather than losing their lubricating capabilities, what lubricants lose are their acid control additives. Lubricants have an "alkaline reserve", which is used to control the "acids" ... until that alkaline reserve is exhausted. after this .... the lubricant will continue to "lubricate" ..... but it will no longer control the acids
a damage by combustion acid, it looks more or less like this:
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