The creasing is normal, but if the leather starts cracking, then your going to have trouble......
It seems the foam cushioning in our seats tend to collapse so easy, my coupe seat is already getting several creases on the outside seat bottom.

You can use a good quality leather cleaner/preserver, but unfortunately I know of no substance that will stop the creasing due to wear/weight......
If you find something please let me know......
I treat my seats about once every other month, depending on how much time I'm in the car......
I found this, it seems to really work great, and no residue or unacceptable smell afterwards.....alot of people on the site also swear by zaino's leather in a bottle, but a few said the scent is more like a shoe than car leather......
hope this helps you.....


04 cpe IP/willow/5at/prem/18's/JDM clear corners/Piaa's/MTEC H4 Super White fog/highs