I change my oil every 5000 kms, which is around 3100mls along with the oil filter, have always stuck to the recommended grade of 10w40 and always fully synthetic oil only, and always the better of the brands, like motul, amsoil, putoline etc, basically whatever’s available, but fully synthetic and same grade, have done 35k kms and all’s well upto now, even mine’s a daily runner/commuter.
Infact what I have come to know, a daily runner/commuter suffers a lot more in stress and wear-tear due to slower speeds and constant usage of clutch/brake, compared to the weekend ridden/open highway bikes.
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