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What I tried to say was:
If it isn't time for a tune up and your timing is correct, then you probably have carbon buildup on your pistons. Using "Seafoam" will remove those deposits so premature detonation will not occur.
A tank of premium will not clean your engine, but should eliminate detonation. There was a reason you used the octane booster, but you should have just used better gas.
There is no need to boost octane in a 700 engine unless you are boosting a turbo higher than 12.
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98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)
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