986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Knocking sound, do I need Octane booster?

MNBoxster · 09-15-2006, 09:12 PM

Hi,

Octane booster is a waste of money. At best, it'll raise your octane a point or two, that means 0.1 or 0.2 octane (and the stuff costs the equivalent of about $27/gal). But, if as you say it's barely audible, I doubt you have a problem.

Pull the sparkplugs and read their insulator color. If whitish-gray, you're detonating, switch to a cooler plug. If a tobacco brown, you're OK. If black, you're running cold and fouling. This is a much better indicator than whatever you're hearing. Hope this helps...

Happy Motoring!... Jim'99

09-15-2006, 09:12 PM	#2
MNBoxster Registered User Join Date: Sep 2005 Location: Minneapolis/St. Paul, Minnesota, USA Posts: 3,308	Hi, Octane booster is a waste of money. At best, it'll raise your octane a point or two, that means 0.1 or 0.2 octane (and the stuff costs the equivalent of about $27/gal). But, if as you say it's barely audible, I doubt you have a problem. Pull the sparkplugs and read their insulator color. If whitish-gray, you're detonating, switch to a cooler plug. If a tobacco brown, you're OK. If black, you're running cold and fouling. This is a much better indicator than whatever you're hearing. Hope this helps... Happy Motoring!... Jim'99 Last edited by MNBoxster; 09-16-2006 at 07:58 AM.