Tapping noise

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I used that stuff on my old MX5 at about 240k miles and it certainly worked. But occasionally it would tap again for a while. Didn't do any harm as it's still being ragged years later.
 
I added some pro tec nanotec additive as i couldn't get the wynss. Its still happening even after the oil change and seems to have gotten a bit louder eventhough it still stops after a few seconds.Could i add the wynss to it too oor should i drain and refill?
 
someone mentioned to me that it may be injector related?i know i have smoke on satrt up and a bit of juddering but would this be the cause of the noise?
 
Just an update in case its of use to anyone. After trying all additives and changing oil a few times , turned out to be the compressor for the aircon was dying a death.disconnected and now motoring quiet :) thanks for all the replies though folks
 
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