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When I had my jeep I used it at EVERY oil change and never had an issue with plugs fouling, sensors going bad etc. All I did was slowly pour 3/4 of the can through the throttle body and then the other 1/4 through the valve cover. Wait 15 minutes, turned the car back on.
I never noticed huge performance gains but it did run a little smoother, etc. Besides, it's never a bad thing to have a good ol' cleaning of your valves, combustion chambers, etc.
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