TMX said:As far as using a higher octane than needed, you don't burn all the fuel and it's either doing to sit there as carbon build up (bad), flow out the exhaust (wasted and emmissions), or worse yet, go past your pistons as deposits and wreck some havok down there. Once the damage is done, well you're stuck using a higher octane because all the build up raises the compression ratio some and decreases the overall chamber sizes so you get even less power all while wasting more money. A loose-loose situation.
TMX said:The spark knock on 1999-2000 V6's was due to a wonderfully designed valve cover that allowed oil vapors to easily pass through the PCV and into the intake. Oil will drop your overall octane rating, hence why you get a slight knock and have to use 89 octane. You can either keep using 89 octane, install a filter into the PCV, or spend $$$ on revised 2001-2004 valve covers with the baffles that are supposed to keep the oil out. If I ever get around to it, I'm going filter route.
http://www.miracerros.com/mustang/pcv_filter.htm < there's a site about it.
TMX said:Course, I'll admit to the same. 89 is 2-3 cents more for me, and I know I have the oil blow by and that's the reason the 89 helps, but it's POURING outside on the one day I have off work and wanted to install the filter and clean my air filter booo =(.
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