Which additive for td4 auto gearbox?

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I think the forum consensus is leave alone if working fine , With a half fluid change at the 60k service interval using the correct ATF 402 !
 

Not sure what my problem in 4th gear is, as failure didn't bring anything up. Thought maybe the carlube atf-u was't best last and to clean it abit up.

Yesterday failure f4 came up and hdc light on. Pulled the hose from turbo boost and disappeared, hope is that one. Good that I ordered it Friday. Hope I'll get it tomorrow. Couldn't do anything else due to heavy rain whole day.
 
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