Not an expert, but I use Lexol and the Maguiers has a new leather cleaner/conditioner in one. I have been using those on my seats for about the past 1 1/2 years. I put it on every other weekend or try to get it on there twice a month.
I'd condition them at least monthly, more if it sits out in the sun with the roof off. You want to keep the leather from drying out, which causes them to crack and look nasty. Meguiers or Mothers leather conditioner is only $5-6 and really makes a difference in how the leather holds up. I had leather in my 2007 Mustang GT and the seats looked new when I traded it after owning it 4 years.
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