Gary, Optima is the way to go. It is the latest and based on the best technology and material used. The Interstate is just another high tech "conventional" battery. I have the Optima battery in my DeLorean for the last 1 1/2 years under every possible temperature, weather and operational loads with no problems at all. It has good power, charges up faster and maintains the charge for a longer period of time. I do not sell the Optima battery line. The Interstate Battery line? I USED to sell them when I had my stores and I also had them in my other cars. I am not knocking the Interstate batteries, for I am only sharing my personal experience in the usage and the differences of these two "different" batteries. Again, if you have the extra money, go for the Optima. Kayo Ong #05508 Lic 9D NY