2006 x3 how to remove oild filter? socket or wrench size?

Go to autoparts store and tell them you need an oil cap wrench for your vechicle. Probably a 76mm. Give them your make and model and this is what it will look like http://www.autozone.com/autozone/accessories/OEM-74-to-76-mm-dia-oil-filter-A-cap-wrench/_/N-25ra?counter=1&filterByKeyWord=oil+filter&fromString=search&itemIdentifier=153157_0_0_ Make sure this is the proper size for your vechicle.