Possible Gas Problem?

Hi,

I know I saw the other 2 thread page about gas and this isn't the same question as I realize now from reading it I should not be putting anything less then 91 through my 04 gp gtp. Now on that same subject... I have had my car for a year and a half and I have always run 87 through it. I plan to switch over now as to not cause any more possible or future damage, but what damage could I have possibly caused. I don't seem to have any problems with it at all except maybe on start up it stutters a bit on very rare occasion. I have occasionally put the pettle to the floor but it never seems to struggle when the charger kicks in.

Thanks

Hard to say, possibly nothing, possible hairline cracks in your pistons, possible chunks missing.

Best to run 91 octane or higher with the 3800SC motor.

The biggest issue with low octane fuel in a S/C 3800 is with detonation. If you constantly hot-rod it, you run a higher risk of doing engine damage. The owners manual says 91 octane or higher is required, not just recommended. The most common engine damage occurs on cyl #4, as it is in the center in back and runs the hottest.