Just bought my first corvette after years of mustangs. Why i didnt do this sooner i dont know. There is a vast difference in performance and the options offered as standard. I have 2 issues. My fuel guage would go to empty when it wasant and i learned in this forum that it is a common problem. I learned to use techron and shell 93. Pennzoil has just come out with a full synthetic motor oil. Should i use this or stay with mobil one?