Use CAT TO-4 transmission fluid, SAE 30, while in the Powershift. It fees only a bit more compared to CAT TO-two spec fluids you obtain with the auto parts keep, and it could prolong the life of the clutches during the Powershift.We also give options for different Caterpillar diesel engine models, like Cat C15 6NZ, C10, C12, C13, 3406E, 3406B/C, an