Did Mackies mention what was wrong with yours?
I can't argue that there are cases such as yours where changing the oil has apparently led to failure, however I do not believe the cause is deposits. Any debris will collect in the sump as it is supposed to while the solvent effect of the circulating oil keeps everything else clean. I would be interested in a teardown of one in such a state to figure out what the underlying cause really is. I'm sure there is something else going on. It would be interesting to get Chester Autos or Mackies opinions on this actually.
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