Each time reset the oil service light cause me Rm20 just using a stupid device, and done within few seconds.It's not worth to do that...Until i found this http://netisak.lpru.ac.th/bmw_e34_diy/reset_oil_service_en.html you can DIY now, is simple and no need to pay. And most important is plug in to the right hole, and follow the instruction carefully. You also can done in few seconds....i dont know anyone share this before, BTW it's awesome.Good Luck