If you want to know if the engine is ok, have a mechanic (preferably a new one, your guys sounds in over his head) perform a compression test and leakdown test. Send an oil sample to Blackstone labs to check and see if there's accelerated wear.
And if knock strength goes up that high, are you sure it's not knocking badly? That won't end well.
Going forward, only buy gas at name brand top tier gas stations, preferably ones with a large enough volume of nice cars so that the 93 tanks get turned over frequently.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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