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Some say to use it every once in a while but to not over do it by adding too often or you run the risk of burning the exhaust valves. Personally I don't think the cleaners are worth it, especially not at sub 100k miles.
As a side note, you may get 1 out of 100 parts counter guys that actually know anything besides thinking they know everything. I would not be listening to a parts guy about additives if for no other reason than he is probably trying to sell you product.
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