Metric set of sockets and COMBINATION wrenches to include 8, 9 10, 12, 13, 14, 17, 19 mm. You will also need a 15/16 inch socket and a handle or 15/16 inch box end for the oil strainer. This covers 99% of the maintenance chores if you include a #2 Phillips screw driver. This will be a START! You will add stuff as you deem neccessary. And, believe me, you will find it neccessary!
Karl
PS: the rest of you guys please chime in on stuff I forgot or got wrong!