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jandref321 ,
Sorry to revive an old thread.
Just looking at doing this, for the read diff. Does the car need to be running for the fill or drain/fill just after been used/driven so its nice and hot.
Just looking at ISTA and it says the diff needs to be at normal operating temperature. And it also mentioned that there is a ISTA component under "QMVH transmission oil change" service function.
Just reading this guide, there is no mention of it.
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