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Reply to "Truly which synthetic brand of motor oil is the best?"

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My assumption is that the oil engineer will spec the oil according to the weakest link within engine and current oil specification.

He Specs the oil according to the service interval requirements and weakest point of the engine, than designs his oil specification. The mineral oil guys will do an oil development if they see a business case for such an oil quality.

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However its also possible that the car could be used for short shopping trips or an owner that lets the horses loose.

Short trip cycle is worst case. The oil has to be changed anyway no matter what quality is used. An owner that lets the horses loose is best case for gasoline engines. He will accumulate miles within a short time and has to go to an oil change after a fixed limit. (e.g Germany for many OEM's: 30.000 km)

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Wheras the former driver may require improved mpg so a thinner oil is specified.
Yes.
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