My personal H3 review and experience

[marin8703]

hey, i know this is probly the wrong place to ask this question but since majorgeek and maybe so of you other guys might know, is there any posibility to damage the engine, exhaust or any other components on teh vehicle by using a higher octane than the recomended, like 89 or 93? keep in mind that i am not triyng to improve milage or anything like that, i just want to keep the engine runing as smooth as possible and lasting a long long time. would a higher octane even help with extending the life of the engine and keep it working good?

i was told by someone that it might damage the catalytic converter because it is hotter burning or something like that. Is that true?

and also i dont really care about gas milage but i would like to keep the engine running nice and as smooth as possible for as long as possible. Would synthetic oil be better or should i stick with the standard one they use when you do an oil change at a hummer dealer?

Thanks alot for your help!