I did a flush with the cheaper Prestone Flush on a VW I had 4 years ago. So much nastiness came out of that thing when I drained it.

I did it because of the goo that had built up everywhere from this old wagon. I actually left it in there for about a week and drove it around before I drained it.

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2004 E60 545i Sport 6MT. Black/Black Build Date 6-2004 102k miles