Drained the CVT again today (3rd drain and fluid was even more translucent). Dropped the pan, cleaned it and the magnets, and replaced the pan filter (didn't really need changed). Replaced the cooler return filter (def. needed changed) and o-ring. Confirmed that the Mitsubishi cooler return filter cover O-ring is the correct part and fits perfectly. Original was in good shape and probably could have been re-used.
Thanks to DiggerDerrick for the filter kits p/n's from O'reilleys. Advanced AutoParts near work had same p/n's (different branding), both in stock. The pan filter kit came w/ a thicker rubber gasket. Never had much luck w/ those types of gaskets. They always get brittle and leak far too soon. After dropping the pan and seeing the OE gasket was thin and rigid, and was in good shape, I elected to clean it off and reuse it. Far superior quality. If it leaks or weeps, I'll order an OE from the zuk dealer. Another drain/fill won't hurt since this drain was still nasty looking.
Thanks also to bdleonard for the Mitsu O-Ring p/n research. Ordered the O-ring...took a day to get it at the local Mitsubishi dealer.
I'll add all this, w/ pics, to my original drain and fill DIY sticky.
2010 Kizashi GTS, CVT, iAWD (3/10 build date)
2011 SX4 Premium Hatch, CVT, iAWD (12/10 build date)
2018 Mazda CX-5 iAWD Touring
2014 Wrangler JKUW (GONE, traded
1991 Samurai, 5-Speed, EFI, Soft-Top (