Description Reviews MINI Cooper S N14 Oil Fill Cap. This cap will fix a worn out, leaking or missing cap. Comes with a new rubber seal to stop any oil or vacuum leaks. This oil fill cap will fit all N14 motors from 2007-2010 for all Cooper S's (R55, R56, R57) as well as all JCW motors for 2011 on R58 and R59 Cooper S models.