Originally Posted by KevinGary

Need to do a complete flush. As far as updating the software I am guessing that you are stuck with the dealer.

Originally Posted by r1racer

I am pretty sure (but don't quote me on this) that the blue fluid is G055162A2 that is found in the 6HP26A61 transmissions that have the W12 engine (only) and if used in others it is considered an upgrade BUT you have to have the software upgraded as well. Some people say the that the newer models (2008-up) have the blue fluid but I am not sure that is the case as the ZF website specifies that fluid for the w-12 engines only. People who say this are more than likely mistaking this with the green fluid that is used in the newer model C6's. At any rate, the model of the transmission is what ultimately determines the correct fluid type, that is unless you have a newer fluid in your transmission already.

The VW oils, from my knowledge, are the following and are found in different models based on the trans type (someone correct me if I'm wrong):

Gold-G052162A2-$15 (for the C5 and also known as Esso LT 71141)
Gold- G055005A2-$35 (standard type for 2005-2007 C6 & tipronic trans)
Green-G060162A2-$47 (standard type for 2008-up but need software update if you upgrading to this type)
Blue-G055162A2- $80 (for 6HP26A61A2 trans with W-12 engine only)


Again, the transmission model is what determines the type, not the car. I'm doing my flush within the next couple of weeks. Gonna get the trans part & serial #'s tomorrow during my 75k so I can order everything this weekend. Pretty sure I need the
G055005A2.