Hi! in Venezuela we have 91 and 95 oct gas(both unleaded ) only.when I did buy the car(about 2 months) I put 95 and I read at the owners manual that the correct are 87 then I put 91 and the valves sound "clac clac" of course I have to return to 95.But what is the problem here?
(Excuse me for my bad english)

 

Octane values may be rated differently in your country. It isn't done the same way everywhere.

 

Thanks a lot for your help!

 

the sound you heard is called "detonation". It's also called "pinging". Sounds almost like a bunch of pop bottles are bumping around in your trunk? (Some people say it sounds like that.)

Like Air_Adam said, your octane rating might be listed differently. Your 91 might be like 85 octane here, and you 95 might be like our 91. Your car should run ok on the lower octane fuel. Sometimes your engine may "carbon up", and not run as well. You could try using a fuel system cleaner, put it in your gas tank, or in your vacuum line (while the car is running). That will clean out the inside of your engine, which may make it run better on the cheaper gas.

 

Hi thanks for your help.gas price is not problem in Venezuela ,because:
1 liter 91: Bs: 90
1 liter 95: Bs: 97
1 US $ = Bs:2150
1 tank to Camaro: 2 bucks ( tip included)

 

 

I'm moving to Venezuela..damnit.

 

DUDE I HATE YOU........LOL. my 91-Z has to run 93 oct here in America, but you may have to run the higher as the engine get older and looses some of its compression, especially as hot as our cars normally run. You did the correct thing by going back to the higher oct, because detonation is a very bad thing. Hey why dont you run us and underground pipeline from your place to here. We would be glad to give you some mark up on the product......lol.