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I used the Marvel Mystery on a noisy motor and it took maybe 30 minutes before it started to really reduce the noise. Kind of a three stage, first started very noisy, but got less scary within a minute or so, added MM and let it fully warm up, and big reduction within 30 min, but may have taken a day or so to fully quiet down.
BTW the loud clicking sound are the injectors, they all open and close at the same time, which makes a fair amount of noise.
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