Mako/Compair/Reavell 5405 compressor sound help

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Sounds like any mako I've ever had, but I've run 5406's for tens of thousands of hours and never seen a bearing or pin go bad. As I say, it sounds like my 5405, but I've never put a stethoscope directly on the block looking for trouble. It sounds a bit like my 3 stage bauer, but my mako doesn't rattle on startup.
It only rattles on start up if the filter towers are empty, I’ll change the oil again once it’s got to 10hrs and check the magnet and if all is spotless I’ll keep running it and just make sure nothing changes in sound or operation, Guess I’m just being a little paranoid cause it doesn’t sound like my little Bauer Oceanus thank you for your assistance/reassurance.
 
https://www.shearwater.com/products/teric/

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