Quote:
Originally Posted by NW-99SS
Only if you get to aggressive and throw an engine code. Other than that - do it with the car outside, you should notice some exhaust smoke with all the contaminants its cleaning from the intake tract and valves.
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Can't say I've used the GM top end engine cleaner but I assume it would work like the Seafoam treatment.
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If you end up doing it, it would be very cool if you posted a video or photo "how to".