Not to mention you’re mixing half of the Red Line ATF, which doesn’t meet the specs of SkyActiv-Drive transmission, with half of the left-over “dirty” Mazda FZ ATF. You can only get half of the old ATF out even if you take off the ATF pan. And there’s no ATF lines to hook up a transmission flushing machine to get old ATF out completely!
My 2 cents:
1 session of drain fill ATF fluid (OEM of course) at say 40k miles means introducing more lubricating properties into the system. BITOG analysis (well per a skyactiv owner in another Mazda forum) indicate the Mazda ATZ fluid's lubrication "additives" should last through 60k miles. Aprox throughout the 60k mile warranty.
1 session's max potential is introducing 40% new lubricating properties. A 2nd session 1 week later means oh 70% new lubrication introduced. A 3rd session 1 week later and the fluid drained becomes clearer thereafter meaning mostly fresh new fluid in there.
So although I'm not dropping the pan to remove the filter, my single drain and fill session at every 40-50k miles means the lubricating properties never reach the "spent" threshold. With the amount of money I'm saving DIY oil changes, cabin filters, spark plugs, ect....I can afford the $60 every 3 years in ATF fluid. On a related note someone posted a European region's schedule of changing skyactiv ATF fluid.
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