Take a look at Sapper M3's used oil analysis report in this recent thread:
http://www.m3post.com/forums/showthr...=310230&page=4. This is a great report on TWS run to 9500 mi with 6 track days, 2 autocross, and 20 drag strip runs. I take issue with some of Blackstone's comments, talking about "excess metals", etc. The wear metals indicate completely normal wear for a M3 as far as I'm concerned. The viscosity is holding at the normal weight for M3's at extended drain intervals. The oil has sheared to a heavy 40 weight. There are some folks on this forum who run Mobil 1 0w40 in their M3 and this oil will rather quickly shear to a 30 weight.
Too bad Sapper M3's report didn't include a measurement of TBN. I think it would indicate the oil could have been run even longer.
To answer your question, yes, you can change the oil at 7500, but you don't need to. Check with your dealer Service Advisor. You can probably get it changed for free under the free annual low mileage rule.
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'14 328d, '13 M3 ZCP, '12 535i, '11 335d, '09 Z4 DINAN Stage II, '05 330i ZHP, '05 M3 ZCP, '02 M3, '91 328i, '90 535i, '88 528e, '88 M5, '87 M6, '95 Z3, 95 M3, '93 M5, '87 325e, '89 535i, '86 635i, '73 Bavaria.