I use Zymol, but there are a bunch of good ones out there. I would definitely do it more than once a year. I do mine once every two months or so, but I rarely drive my truck. In an old silverado I had I did it at least every month sometimes more and when I sold the truck the seats had no creases or wrinkles in 50k miles worth of driving.
I use Lexol for leather cleaning/conditioning. I would apply it about once a month to my Tahoe when I had it. When the drivers seat starts to feel dryer than the others then its time for a re-application. Also works great on motorcycle leathers.
A forum community dedicated to Dodge Cummins Diesel truck owners and enthusiasts. Come join the discussion about reviews, drivetrain swaps, turbos, modifications, classifieds, builds, troubleshooting, maintenance, and more!