If you're going to buy a wrench for the oil filter housing, get the right one. Dealer might have one but not at $17! Here is one example -

http://www.toolsource.com/filter-socket-wrench-745mm-flats-p-96484.html

You can also use a 'strap' style universal from the auto parts store. But you won't be able to use a torque wrench. If that matters to you.

Good luck.