So last time I did my transmission fluid and rear diff changed I filled both ATF-Z1 and apparently there was an update saying that your rear diff is suppose to be DPSF and transmission is suppose to be DW-1 now. Well I didn't know that (went by using the service manual) That was about 20,000km already and now I'm wondering do I have to do a full flush or can I just drain and fill and just live on...?
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