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Originally Posted by Flashmn
Modern gasolines have cleaners in them and they dont make carbon deposits. thats more/less a thing of the past.
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it depends where you fill up at, Mazda was having a hell of a time with their 2.5 V6 getting clogged up with carbon, eventually they and other makers went onto certify ONLY certain gasoline brands as "Top Tier" fuels, which means they have the correct amounts of additives as needed by the automakers. typically 7-11, walmart, flying J, and grocery store gas stations fuels do not have these additives and do not meet the 'Top Tier' specs for fuel quality.
http://www.toptiergas.com/
http://www.toptiergas.com/deposit_control.html
i know it looks like a bunch of hooey put on by some fuel makers and auto makers, but its honestly not. I've talked to GM techs who've pulled heads on motors still under warranty and found carbon deposits that were causing detonation. perhaps in finland (and europe in general) they have stricter fuel standards.
