having used both, i'd say there's no adverse effect using those two products. i use fuel injector cleaner(the one you mix with the fuel in between fill-ups) and the spray-on carb cleaner. normally, i would use the fuel injector cleaner during my PMS every 5000 kms. as for the carb cleaner, i used it once when my throttle-body becomes dirty (rough idling, erratic idling, etc.).




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