HI, I have  X3 3ltr d with auto gearbox and it looks like a sealed box, how do I get some top up oil in .????? any suggestions welcome peter.

Morning Steve Welcome to the Forum

Your Gearbox should be the ZF 6 speed box, normally when it is serviced the sump on the box is dropped so that the filter inside can be changed. While it is a DIY proposition it is a job far easier done on a ramp. ZF recommend service at around 80k km I had mine serviced by ZF at Crick took 3 hours and they are very thorough. There are many ZF specialists around but any competent autobox specialist and most good garages should be able to do it.

If you do want to do it yourself have a look at www.newtis.info it has all the technical information you need (the same as used by BMW Dealers) You could also look at www.pelicanparts.com an American site so steering on the wrong side and no diesels but great how too's with step by step pictures.

Hope this gives you what you need

Dave