Wunderlich - Oil Filter ToolThe right tool for the job: practical, easy to use and without damage to the filter now the oil filter can be changed professionally. The tools available seem too expensive and impractical to us, so we designed our own. The special feature of our own invention is that the filter has both a hexagonal head for use with the on board spark plug cap, or alternatively with a Torx key. This oil filter tool was, from its conception, too complex to manufacture