Why would you intentionally run non-synthetic? With current engine temps on turbo charged, DI engines, I wouldn't go near dino-oil.
I did Blackstone tests on the 1er and have seen plenty of results from 15k mile oil changes and there just isn't enough evidence to make me think it's worth spending the additional money. Whatever makes you comfortable though, what I do shouldn't really influence you at all.
Finally, maybe I'm not understanding what you want to do, if you simply want to do a low mileage oil change and then continue on with the regularly scheduled oil changes, yes, then reset the oil service counter. If you want to double up the oil changes, then leave it where it is.
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