Excuse my ignorance here, but I'm curious why a fluid & filter change would kill this transmission. Not arguing, I'm just sure there's some fuzzy logic at play that I don't quite understand so enlighten me.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)