I am not kidding. I swear, for months uppon months, I would have this stupid starting problem. It would take forever for my Z to start when it sat for a few minutes after warm. One day I decided to use 76 and then I turned the key and, VVVVVVVVRRRRRRRROOOOOOOOOOMMMMMMMMM!!!!!!!!!! The monster had been awaken. I even tried techron and that still did not help. I had to go back to 76. I think the reason for this is that the use Ethanol instead of MTBE as an oxygenizer. MTBE is bad for cars and the enviroment anyways. Ethanol rules! Joseph