What's the difference bewteen SeaFoam and GM Top Engine treatment.
SOA is stumped with the pinging with 89 octane when it should be OK with 87 octane on my 2000GT AT and is recommending the GM before replacing the 'puter (still under extended warranty).
The car has behaved this way from day 1 but only recently did I try to save $ on premium fuel and try the lower grades as specified in manual. It's got new plugs, knock sensor, even adjusted the timing as the belt was 1 tooth off from factory (yet never threw a code) and multiple BG44K and Fuel Booster runs through the tank.
With a history that goes back to the 1st day, will flushing the throttle body have any more effect than changing the headlight fluid?
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SeaFoam or GM
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