How often should I be using leather conditioner on my seats? Also, my cousin had a car with leather interior and she would use saddle oil because it would last for six months or something. Is this advisable?

Saddle oil/soap is a no no. It does not work well with the leather on a seat cover.

If you have heated seats and use them I would go with 4 times a year for applying a cleaned moisturizer type leather conditioner. If the seats are not heated then twice a year is fine.

Alright. Thanks man.