Keep us posted... The Subaru CVT needs a specific temp ... and then you truly only flush about 4.5-5.5 qts.... that’s with a pan drain... however after reading some and watching videos... found a fill plug high on the cvt transmission that accepts transmission fluid... so measured the drained, refilled with approximately the same amount and drove beautifully... did this 3 times over a week... pretty much new fluid change only slight dilution. Didn’t have to worry about a new gasket and dropping pan... or temp settings. I put 323,000 miles on that Crosstrek.
Watch the GLA-250 4-matic posts and videos on Utube much more info!