Thread: Is everyone using 91 octane?
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Old 05-11-2008, 06:53 AM
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Chsmadden Chsmadden is offline
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Location: San Carlos, California
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Quote:
Originally Posted by tulsalfa View Post
I ran one tank of 87 octane gas (by mistake) through my 86 Grad with no noticeable effect. I do add a bit of Lucas Gas Treatment with each tank. Has anyone had any experience with running less than 91 octane gasoline? Will the computer reset for the lower grade? Am I causing some unseen damage by running 87 octane either4 sporadically or even constantly? Any advice would be MOST appreciated.

Dean
You will be fine if it's a bone stock engine(8-9:1 CR). Higher compression engines need higher octane gas to keep them from pre-igniting/knocking. If it has a computer, any car can run on any gas(except diesel). Older cars w/o knock sensors and EFI just keep on knocking and that is really bad for the engine.
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