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I've used it in several vehicles and also in each way directed... Through a vacuum line is definitely the most effective and fastest way to clean up the valves and cylinders. Putting it in your gas tank is more for doing it periodically, although I wouldn't recommend doing it too often. And putting it in your oil essentially just thins out the oil a little bit and also mixes additives which help clean out the grime in the lower half of the engine. A lot of guys swear by Seafoam, and of course there are some that don't like it as well.
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