Re: what grade of gasoline to use
You should be able to go back to regular. The only prob is you may have damaged your engine, I'm not sure, the car is set up for 87 oct, 92 pushes it if your not set up for it. I think 92 is offered for people that have big trucks or high performance cars that need a bigger ping rate then stock. I run 89 oct due too a modded motor, stamped rockers, msd, bosch plugs, headers, glasspacks, hei distrubitor, and cold air intake with ported intake. I may even be pushing with 89 oct due to stock old rings and pistons.