Outlaw-Hondaz

My car info: 97 Civic Hatch w/ 97 Itr Full Swap

Story: I let my sister borrow my car yesterday and the gas was low and I always pump 91 premium, but when she came home she told my she had pump 87 (unleaded). I heard stories that it can mess up the motor, is this true, HELP ME! What should I do?!?

Crashtestdummy

It can mess up the motor but one tank full of 87 won't hurt it. When the gas was impossible to get in atlanta a few years ago i had to run 87 in my high comp d16 for two weeks, it was fine just a slight ping under hard acceleration.

grumblemarc

iTrader: (4)

Throw some octane additive in the tank. No need to panic.

Outlaw-Hondaz

is it needed when there was already a little of the 91 in the tank, because it was only pumped half a tank of 87

grumblemarc

iTrader: (4)

I don't want to tell you yes or no. I couldn't tell you. It was just a suggestion. I don't loan out my car, not even to my wife, so I never had to balance octane in a gas tank before. If you want to further "dilute" the 87 then fill it up with 91.

deadazleep

just dont drive it hard till you run the 87 out

94EG8

If it's a stock ITR running a stock ITR ECU with a knock sensor I wouldn't worry about it all, if it starts to knock under load the ECU will just retard the timing, if it's running on a chipped OBD1 ECU with no knock sensor i still wouldn't be overly concerned, but I might through some octane booster in the tank or if it the tank is only say half full fill the rest with 91.