I think it may just be dumb marketing. I don't know where I read this, but they tested two cars with synthetic oil. One was changed every 7500 miles and the other was changed every 30 something thousand. Both engines showed alsmot no wear at some incredibly high mileage. I think it was 200,000. I read this a while ago when I was Googling around to see what the best synthetic is. Popular opinion went with Mobil 1, so I use that. Point is, any synthetic oil can go a long time without having to be changed.
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