I can't comment on the aluminium particles, but my gut feeling is they shouldn't be there
with flushing i have used parafin / Kerosene to flush the gearbox after a deep swim. If you cant get that, i would rather go with diesel over gas, just because it is closer to being an oil - and you are less likely to set yourself on fire
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2003 txt250 Pro
2013 Ossa 280i
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