Evotech oil filler caps are machined from aluminium billet using sophisticated CNC machineries. We created these with a hexagonal head in order to help avoid someone stealing your oil cap. In fact, it is necessary to have a particular key to open the cap. Some holes have been made around its shape for fixing safety wire which is required during competitions. The 6 milled pockets and the 6 holes give our oil caps lightness but without reducing its strength. For the assembling simply use a hexagonal key or better pawl keys.
We would like to point out that compared to others Evotech products, the colouring of oil filler cap could degrade more easily as in contact with heat sources. Therefore the 5-year warranty on this product is not valid.