Did you know you can use olive oil to protect your dashboard and make it shine? I have not tried it on my Blazer, but I have used it on my other vehicles. The shine lasts longer than armor all.

 

I would not use food based oil on or in the car. The olive oil will spoil, and also in the long run, the food based oil can deteriorate the dash material.

Use some automotive UV protectant product that is safe on plastics/vinyl. 303 aerospace UV protectant gives a nice lasting shine, and also protects it from UV