I have a new car that has known issues with the vinyl bolsters on the sport seats. They tend to develop cracks. What can I use to help prolong the life of the vinyl? I think I need more than a protectant. I guess I'm looking for something more like a leather conditioner but for vinyl. I would assume that if I could keep the material soft and supple, it could take the stress of getting in and out of the car better. The center of the seat is leather.