While under warranty, Toyota demand that you ONLY use ATF that meets JWS3309 spec. This means Toyota T-IV ATF or Mobil 3309 ATF Having said this, there are quite a few better fluids that are "compatible" with Toyota auto trans requiring T-IV. Examples include AMSOIL universal ATF, Penrite SIN ATF, Castrol Import ATF just to name a few ... It really depends on whether you are still under factory warranty or not My old MPV was playing up in the trans was making funny noises and slipping when cold I got it serviced $210.00 and it went fine but the shop that did the job said it was showing signs of wear as there were debris in the filter your corolla may just need a service.