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Old 10-26-2012, 12:04 AM   #4
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Join Date: Oct 2012
Location: White Rock, B.C.
Posts: 13
My Ride: 2000 328ci
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Originally Posted by Zell View Post
High compression engines require high octane. When you compress things, they get hotter, and a higher octane rating will prevent spontaneous combustion from compression. If you use a lower octane, your car will compensate, but you will lose gas mileage as a result.
Okay but isn't that what an octane booster does? Increase the octane? So what's the difference between putting an octane boost in 87 compared to simply just putting in 91 or 93?
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