I verified to make sure and in fact they do take the same oil. it is my understanding
PDQ recommends different weights for summer/winter depending on conditions. I have
doors so my bays stay pretty toasty in the winter and I don't worry about switching. To be honest I didn't worry about it before I had the
doors. I have never had a gearbox issue. Temps here get into the teens occasionally in the winter. Happy Holidays!